diff --git a/src/Microsoft.AspNetCore.Authentication.Cookies/CookieAuthenticationInitializer.cs b/src/Microsoft.AspNetCore.Authentication.Cookies/CookieAuthenticationPostConfigureOptions.cs
similarity index 81%
rename from src/Microsoft.AspNetCore.Authentication.Cookies/CookieAuthenticationInitializer.cs
rename to src/Microsoft.AspNetCore.Authentication.Cookies/CookieAuthenticationPostConfigureOptions.cs
index af4a85b191..38211e0f19 100644
--- a/src/Microsoft.AspNetCore.Authentication.Cookies/CookieAuthenticationInitializer.cs
+++ b/src/Microsoft.AspNetCore.Authentication.Cookies/CookieAuthenticationPostConfigureOptions.cs
@@ -10,21 +10,21 @@ namespace Microsoft.AspNetCore.Authentication.Cookies
     /// <summary>
     /// Used to setup defaults for all <see cref="CookieAuthenticationOptions"/>.
     /// </summary>
-    public class CookieAuthenticationInitializer : IInitializeOptions<CookieAuthenticationOptions>
+    public class PostConfigureCookieAuthenticationOptions : IPostConfigureOptions<CookieAuthenticationOptions>
     {
         private readonly IDataProtectionProvider _dp;
 
-        public CookieAuthenticationInitializer(IDataProtectionProvider dataProtection)
+        public PostConfigureCookieAuthenticationOptions(IDataProtectionProvider dataProtection)
         {
             _dp = dataProtection;
         }
 
         /// <summary>
-        /// Invoked to initialize a TOptions instance.
+        /// Invoked to post configure a TOptions instance.
         /// </summary>
-        /// <param name="name">The name of the options instance being initialized.</param>
-        /// <param name="options">The options instance to initialize.</param>
-        public void Initialize(string name, CookieAuthenticationOptions options)
+        /// <param name="name">The name of the options instance being configured.</param>
+        /// <param name="options">The options instance to configure.</param>
+        public void PostConfigure(string name, CookieAuthenticationOptions options)
         {
             options.DataProtectionProvider = options.DataProtectionProvider ?? _dp;
 
diff --git a/src/Microsoft.AspNetCore.Authentication.Cookies/CookieExtensions.cs b/src/Microsoft.AspNetCore.Authentication.Cookies/CookieExtensions.cs
index b528dec9cb..6f23abcc4a 100644
--- a/src/Microsoft.AspNetCore.Authentication.Cookies/CookieExtensions.cs
+++ b/src/Microsoft.AspNetCore.Authentication.Cookies/CookieExtensions.cs
@@ -21,7 +21,7 @@ namespace Microsoft.Extensions.DependencyInjection
 
         public static IServiceCollection AddCookieAuthentication(this IServiceCollection services, string authenticationScheme, Action<CookieAuthenticationOptions> configureOptions)
         {
-            services.TryAddEnumerable(ServiceDescriptor.Singleton<IInitializeOptions<CookieAuthenticationOptions>, CookieAuthenticationInitializer>());
+            services.TryAddEnumerable(ServiceDescriptor.Singleton<IPostConfigureOptions<CookieAuthenticationOptions>, PostConfigureCookieAuthenticationOptions>());
             return services.AddScheme<CookieAuthenticationOptions, CookieAuthenticationHandler>(authenticationScheme, configureOptions);
         }
     }
diff --git a/src/Microsoft.AspNetCore.Authentication.Facebook/FacebookExtensions.cs b/src/Microsoft.AspNetCore.Authentication.Facebook/FacebookExtensions.cs
index 1bb065414d..7d6fb84421 100644
--- a/src/Microsoft.AspNetCore.Authentication.Facebook/FacebookExtensions.cs
+++ b/src/Microsoft.AspNetCore.Authentication.Facebook/FacebookExtensions.cs
@@ -3,6 +3,7 @@
 
 using System;
 using Microsoft.AspNetCore.Authentication.Facebook;
+using Microsoft.AspNetCore.Authentication.Facebook.Internal;
 using Microsoft.Extensions.Options.Infrastructure;
 
 namespace Microsoft.Extensions.DependencyInjection
diff --git a/src/Microsoft.AspNetCore.Authentication.Facebook/FacebookConfigureOptions.cs b/src/Microsoft.AspNetCore.Authentication.Facebook/Internal/FacebookConfigureOptions.cs
similarity index 78%
rename from src/Microsoft.AspNetCore.Authentication.Facebook/FacebookConfigureOptions.cs
rename to src/Microsoft.AspNetCore.Authentication.Facebook/Internal/FacebookConfigureOptions.cs
index 887789ebf1..df1ab710bd 100644
--- a/src/Microsoft.AspNetCore.Authentication.Facebook/FacebookConfigureOptions.cs
+++ b/src/Microsoft.AspNetCore.Authentication.Facebook/Internal/FacebookConfigureOptions.cs
@@ -4,9 +4,9 @@
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Options.Infrastructure;
 
-namespace Microsoft.AspNetCore.Authentication.Facebook
+namespace Microsoft.AspNetCore.Authentication.Facebook.Internal
 {
-    internal class FacebookConfigureOptions : ConfigureDefaultOptions<FacebookOptions>
+    public class FacebookConfigureOptions : ConfigureDefaultOptions<FacebookOptions>
     {
         public FacebookConfigureOptions(IConfiguration config) :
             base(FacebookDefaults.AuthenticationScheme,
diff --git a/src/Microsoft.AspNetCore.Authentication.Google/GoogleExtensions.cs b/src/Microsoft.AspNetCore.Authentication.Google/GoogleExtensions.cs
index c11b155d9c..07d3e16d61 100644
--- a/src/Microsoft.AspNetCore.Authentication.Google/GoogleExtensions.cs
+++ b/src/Microsoft.AspNetCore.Authentication.Google/GoogleExtensions.cs
@@ -3,6 +3,7 @@
 
 using System;
 using Microsoft.AspNetCore.Authentication.Google;
+using Microsoft.AspNetCore.Authentication.Google.Internal;
 using Microsoft.Extensions.Options.Infrastructure;
 
 namespace Microsoft.Extensions.DependencyInjection
diff --git a/src/Microsoft.AspNetCore.Authentication.Google/GoogleConfigureOptions.cs b/src/Microsoft.AspNetCore.Authentication.Google/Internal/GoogleConfigureOptions.cs
similarity index 79%
rename from src/Microsoft.AspNetCore.Authentication.Google/GoogleConfigureOptions.cs
rename to src/Microsoft.AspNetCore.Authentication.Google/Internal/GoogleConfigureOptions.cs
index 1041f1eec5..bbc5e208a7 100644
--- a/src/Microsoft.AspNetCore.Authentication.Google/GoogleConfigureOptions.cs
+++ b/src/Microsoft.AspNetCore.Authentication.Google/Internal/GoogleConfigureOptions.cs
@@ -4,9 +4,9 @@
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Options.Infrastructure;
 
-namespace Microsoft.AspNetCore.Authentication.Google
+namespace Microsoft.AspNetCore.Authentication.Google.Internal
 {
-    internal class GoogleConfigureOptions : ConfigureDefaultOptions<GoogleOptions>
+    public class GoogleConfigureOptions : ConfigureDefaultOptions<GoogleOptions>
     {
         public GoogleConfigureOptions(IConfiguration config) :
             base(GoogleDefaults.AuthenticationScheme,
diff --git a/src/Microsoft.AspNetCore.Authentication.JwtBearer/JwtBearerConfigureOptions.cs b/src/Microsoft.AspNetCore.Authentication.JwtBearer/Internal/JwtBearerConfigureOptions.cs
similarity index 79%
rename from src/Microsoft.AspNetCore.Authentication.JwtBearer/JwtBearerConfigureOptions.cs
rename to src/Microsoft.AspNetCore.Authentication.JwtBearer/Internal/JwtBearerConfigureOptions.cs
index d26bf66711..5c1e931f40 100644
--- a/src/Microsoft.AspNetCore.Authentication.JwtBearer/JwtBearerConfigureOptions.cs
+++ b/src/Microsoft.AspNetCore.Authentication.JwtBearer/Internal/JwtBearerConfigureOptions.cs
@@ -4,9 +4,9 @@
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Options.Infrastructure;
 
-namespace Microsoft.AspNetCore.Authentication.JwtBearer
+namespace Microsoft.AspNetCore.Authentication.JwtBearer.Internal
 {
-    internal class JwtBearerConfigureOptions : ConfigureDefaultOptions<JwtBearerOptions>
+    public class JwtBearerConfigureOptions : ConfigureDefaultOptions<JwtBearerOptions>
     {
         // Bind to "Bearer" section by default
         public JwtBearerConfigureOptions(IConfiguration config) :
diff --git a/src/Microsoft.AspNetCore.Authentication.JwtBearer/JwtBearerExtensions.cs b/src/Microsoft.AspNetCore.Authentication.JwtBearer/JwtBearerExtensions.cs
index 0bd3a9400c..134e99920b 100644
--- a/src/Microsoft.AspNetCore.Authentication.JwtBearer/JwtBearerExtensions.cs
+++ b/src/Microsoft.AspNetCore.Authentication.JwtBearer/JwtBearerExtensions.cs
@@ -3,6 +3,7 @@
 
 using System;
 using Microsoft.AspNetCore.Authentication.JwtBearer;
+using Microsoft.AspNetCore.Authentication.JwtBearer.Internal;
 using Microsoft.Extensions.DependencyInjection.Extensions;
 using Microsoft.Extensions.Options;
 using Microsoft.Extensions.Options.Infrastructure;
@@ -19,7 +20,7 @@ namespace Microsoft.Extensions.DependencyInjection
 
         public static IServiceCollection AddJwtBearerAuthentication(this IServiceCollection services, string authenticationScheme, Action<JwtBearerOptions> configureOptions)
         {
-            services.TryAddEnumerable(ServiceDescriptor.Singleton<IInitializeOptions<JwtBearerOptions>, JwtBearerInitializer>());
+            services.TryAddEnumerable(ServiceDescriptor.Singleton<IPostConfigureOptions<JwtBearerOptions>, JwtBearerPostConfigureOptions>());
             services.AddSingleton<ConfigureDefaultOptions<JwtBearerOptions>, JwtBearerConfigureOptions>();
             return services.AddScheme<JwtBearerOptions, JwtBearerHandler>(authenticationScheme, configureOptions);
         }
diff --git a/src/Microsoft.AspNetCore.Authentication.JwtBearer/JwtBearerInitializer.cs b/src/Microsoft.AspNetCore.Authentication.JwtBearer/JwtBearerPostConfigureOptions.cs
similarity index 89%
rename from src/Microsoft.AspNetCore.Authentication.JwtBearer/JwtBearerInitializer.cs
rename to src/Microsoft.AspNetCore.Authentication.JwtBearer/JwtBearerPostConfigureOptions.cs
index 0aeed11832..8829bfac0f 100644
--- a/src/Microsoft.AspNetCore.Authentication.JwtBearer/JwtBearerInitializer.cs
+++ b/src/Microsoft.AspNetCore.Authentication.JwtBearer/JwtBearerPostConfigureOptions.cs
@@ -12,14 +12,14 @@ namespace Microsoft.AspNetCore.Authentication.JwtBearer
     /// <summary>
     /// Used to setup defaults for all <see cref="JwtBearerOptions"/>.
     /// </summary>
-    public class JwtBearerInitializer : IInitializeOptions<JwtBearerOptions>
+    public class JwtBearerPostConfigureOptions : IPostConfigureOptions<JwtBearerOptions>
     {
         /// <summary>
-        /// Invoked to initialize a JwtBearerOptions instance.
+        /// Invoked to post configure a JwtBearerOptions instance.
         /// </summary>
-        /// <param name="name">The name of the options instance being initialized.</param>
-        /// <param name="options">The options instance to initialize.</param>
-        public void Initialize(string name, JwtBearerOptions options)
+        /// <param name="name">The name of the options instance being configured.</param>
+        /// <param name="options">The options instance to configure.</param>
+        public void PostConfigure(string name, JwtBearerOptions options)
         {
             if (string.IsNullOrEmpty(options.TokenValidationParameters.ValidAudience) && !string.IsNullOrEmpty(options.Audience))
             {
diff --git a/src/Microsoft.AspNetCore.Authentication.MicrosoftAccount/MicrosoftAccountConfigureOptions.cs b/src/Microsoft.AspNetCore.Authentication.MicrosoftAccount/Internal/MicrosoftAccountConfigureOptions.cs
similarity index 78%
rename from src/Microsoft.AspNetCore.Authentication.MicrosoftAccount/MicrosoftAccountConfigureOptions.cs
rename to src/Microsoft.AspNetCore.Authentication.MicrosoftAccount/Internal/MicrosoftAccountConfigureOptions.cs
index b0be3de977..60591e1e4a 100644
--- a/src/Microsoft.AspNetCore.Authentication.MicrosoftAccount/MicrosoftAccountConfigureOptions.cs
+++ b/src/Microsoft.AspNetCore.Authentication.MicrosoftAccount/Internal/MicrosoftAccountConfigureOptions.cs
@@ -4,9 +4,9 @@
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Options.Infrastructure;
 
-namespace Microsoft.AspNetCore.Authentication.MicrosoftAccount
+namespace Microsoft.AspNetCore.Authentication.MicrosoftAccount.Internal
 {
-    internal class MicrosoftAccountConfigureOptions : ConfigureDefaultOptions<MicrosoftAccountOptions>
+    public class MicrosoftAccountConfigureOptions : ConfigureDefaultOptions<MicrosoftAccountOptions>
     {
         // Bind to "Microsoft" section by default
         public MicrosoftAccountConfigureOptions(IConfiguration config) :
diff --git a/src/Microsoft.AspNetCore.Authentication.MicrosoftAccount/MicrosoftAccountExtensions.cs b/src/Microsoft.AspNetCore.Authentication.MicrosoftAccount/MicrosoftAccountExtensions.cs
index 1a7fee370f..ff743c9728 100644
--- a/src/Microsoft.AspNetCore.Authentication.MicrosoftAccount/MicrosoftAccountExtensions.cs
+++ b/src/Microsoft.AspNetCore.Authentication.MicrosoftAccount/MicrosoftAccountExtensions.cs
@@ -3,6 +3,7 @@
 
 using System;
 using Microsoft.AspNetCore.Authentication.MicrosoftAccount;
+using Microsoft.AspNetCore.Authentication.MicrosoftAccount.Internal;
 using Microsoft.Extensions.Options.Infrastructure;
 
 namespace Microsoft.Extensions.DependencyInjection
diff --git a/src/Microsoft.AspNetCore.Authentication.OAuth/OAuthExtensions.cs b/src/Microsoft.AspNetCore.Authentication.OAuth/OAuthExtensions.cs
index 257aed9cb1..4ad0a83362 100644
--- a/src/Microsoft.AspNetCore.Authentication.OAuth/OAuthExtensions.cs
+++ b/src/Microsoft.AspNetCore.Authentication.OAuth/OAuthExtensions.cs
@@ -19,7 +19,7 @@ namespace Microsoft.Extensions.DependencyInjection
             where TOptions : OAuthOptions, new()
             where THandler : OAuthHandler<TOptions>
         {
-            services.TryAddEnumerable(ServiceDescriptor.Singleton<IInitializeOptions<TOptions>, OAuthInitializer<TOptions, THandler>>());
+            services.TryAddEnumerable(ServiceDescriptor.Singleton<IPostConfigureOptions<TOptions>, OAuthPostConfigureOptions<TOptions, THandler>>());
             return services.AddRemoteScheme<TOptions, THandler>(authenticationScheme, authenticationScheme, configureOptions);
         }
     }
diff --git a/src/Microsoft.AspNetCore.Authentication.OAuth/OAuthInitializer.cs b/src/Microsoft.AspNetCore.Authentication.OAuth/OAuthPostConfigureOptions.cs
similarity index 86%
rename from src/Microsoft.AspNetCore.Authentication.OAuth/OAuthInitializer.cs
rename to src/Microsoft.AspNetCore.Authentication.OAuth/OAuthPostConfigureOptions.cs
index 99f65253a8..e97346413c 100644
--- a/src/Microsoft.AspNetCore.Authentication.OAuth/OAuthInitializer.cs
+++ b/src/Microsoft.AspNetCore.Authentication.OAuth/OAuthPostConfigureOptions.cs
@@ -12,18 +12,18 @@ namespace Microsoft.Extensions.DependencyInjection
     /// <summary>
     /// Used to setup defaults for the OAuthOptions.
     /// </summary>
-    public class OAuthInitializer<TOptions, THandler> : IInitializeOptions<TOptions>
+    public class OAuthPostConfigureOptions<TOptions, THandler> : IPostConfigureOptions<TOptions>
         where TOptions : OAuthOptions, new()
         where THandler : OAuthHandler<TOptions>
     {
         private readonly IDataProtectionProvider _dp;
 
-        public OAuthInitializer(IDataProtectionProvider dataProtection)
+        public OAuthPostConfigureOptions(IDataProtectionProvider dataProtection)
         {
             _dp = dataProtection;
         }
 
-        public void Initialize(string name, TOptions options)
+        public void PostConfigure(string name, TOptions options)
         {
             options.DataProtectionProvider = options.DataProtectionProvider ?? _dp;
             if (options.Backchannel == null)
diff --git a/src/Microsoft.AspNetCore.Authentication.OpenIdConnect/OpenIdConnectConfigureOptions.cs b/src/Microsoft.AspNetCore.Authentication.OpenIdConnect/Internal/OpenIdConnectConfigureOptions.cs
similarity index 91%
rename from src/Microsoft.AspNetCore.Authentication.OpenIdConnect/OpenIdConnectConfigureOptions.cs
rename to src/Microsoft.AspNetCore.Authentication.OpenIdConnect/Internal/OpenIdConnectConfigureOptions.cs
index 1a6450b7b2..c395185151 100644
--- a/src/Microsoft.AspNetCore.Authentication.OpenIdConnect/OpenIdConnectConfigureOptions.cs
+++ b/src/Microsoft.AspNetCore.Authentication.OpenIdConnect/Internal/OpenIdConnectConfigureOptions.cs
@@ -4,7 +4,7 @@
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Options.Infrastructure;
 
-namespace Microsoft.AspNetCore.Authentication.OpenIdConnect
+namespace Microsoft.AspNetCore.Authentication.OpenIdConnect.Internal
 {
     internal class OpenIdConnectConfigureOptions : ConfigureDefaultOptions<OpenIdConnectOptions>
     {
diff --git a/src/Microsoft.AspNetCore.Authentication.OpenIdConnect/OpenIdConnectExtensions.cs b/src/Microsoft.AspNetCore.Authentication.OpenIdConnect/OpenIdConnectExtensions.cs
index b4ac4b9fb7..6c965f047c 100644
--- a/src/Microsoft.AspNetCore.Authentication.OpenIdConnect/OpenIdConnectExtensions.cs
+++ b/src/Microsoft.AspNetCore.Authentication.OpenIdConnect/OpenIdConnectExtensions.cs
@@ -3,6 +3,7 @@
 
 using System;
 using Microsoft.AspNetCore.Authentication.OpenIdConnect;
+using Microsoft.AspNetCore.Authentication.OpenIdConnect.Internal;
 using Microsoft.Extensions.DependencyInjection.Extensions;
 using Microsoft.Extensions.Options;
 using Microsoft.Extensions.Options.Infrastructure;
@@ -19,7 +20,7 @@ namespace Microsoft.Extensions.DependencyInjection
 
         public static IServiceCollection AddOpenIdConnectAuthentication(this IServiceCollection services, string authenticationScheme, Action<OpenIdConnectOptions> configureOptions)
         {
-            services.TryAddEnumerable(ServiceDescriptor.Singleton<IInitializeOptions<OpenIdConnectOptions>, OpenIdConnectInitializer>());
+            services.TryAddEnumerable(ServiceDescriptor.Singleton<IPostConfigureOptions<OpenIdConnectOptions>, OpenIdConnectPostConfigureOptions>());
             services.AddSingleton<ConfigureDefaultOptions<OpenIdConnectOptions>, OpenIdConnectConfigureOptions>();
             return services.AddRemoteScheme<OpenIdConnectOptions, OpenIdConnectHandler>(authenticationScheme, authenticationScheme, configureOptions);
         }
diff --git a/src/Microsoft.AspNetCore.Authentication.OpenIdConnect/OpenIdConnectInitializer.cs b/src/Microsoft.AspNetCore.Authentication.OpenIdConnect/OpenIdConnectPostConfigureOptions.cs
similarity index 91%
rename from src/Microsoft.AspNetCore.Authentication.OpenIdConnect/OpenIdConnectInitializer.cs
rename to src/Microsoft.AspNetCore.Authentication.OpenIdConnect/OpenIdConnectPostConfigureOptions.cs
index 7421af9c0a..b79f1d1edf 100644
--- a/src/Microsoft.AspNetCore.Authentication.OpenIdConnect/OpenIdConnectInitializer.cs
+++ b/src/Microsoft.AspNetCore.Authentication.OpenIdConnect/OpenIdConnectPostConfigureOptions.cs
@@ -14,21 +14,21 @@ namespace Microsoft.AspNetCore.Authentication.OpenIdConnect
     /// <summary>
     /// Used to setup defaults for all <see cref="OpenIdConnectOptions"/>.
     /// </summary>
-    public class OpenIdConnectInitializer : IInitializeOptions<OpenIdConnectOptions>
+    public class OpenIdConnectPostConfigureOptions : IPostConfigureOptions<OpenIdConnectOptions>
     {
         private readonly IDataProtectionProvider _dp;
 
-        public OpenIdConnectInitializer(IDataProtectionProvider dataProtection)
+        public OpenIdConnectPostConfigureOptions(IDataProtectionProvider dataProtection)
         {
             _dp = dataProtection;
         }
 
         /// <summary>
-        /// Invoked to initialize a TOptions instance.
+        /// Invoked to post configure a TOptions instance.
         /// </summary>
-        /// <param name="name">The name of the options instance being initialized.</param>
-        /// <param name="options">The options instance to initialize.</param>
-        public void Initialize(string name, OpenIdConnectOptions options)
+        /// <param name="name">The name of the options instance being configured.</param>
+        /// <param name="options">The options instance to configure.</param>
+        public void PostConfigure(string name, OpenIdConnectOptions options)
         {
             options.DataProtectionProvider = options.DataProtectionProvider ?? _dp;
 
diff --git a/src/Microsoft.AspNetCore.Authentication.Twitter/TwitterConfigureOptions.cs b/src/Microsoft.AspNetCore.Authentication.Twitter/Internal/TwitterConfigureOptions.cs
similarity index 80%
rename from src/Microsoft.AspNetCore.Authentication.Twitter/TwitterConfigureOptions.cs
rename to src/Microsoft.AspNetCore.Authentication.Twitter/Internal/TwitterConfigureOptions.cs
index 03d7ae8092..62982fa19a 100644
--- a/src/Microsoft.AspNetCore.Authentication.Twitter/TwitterConfigureOptions.cs
+++ b/src/Microsoft.AspNetCore.Authentication.Twitter/Internal/TwitterConfigureOptions.cs
@@ -4,9 +4,9 @@
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Options.Infrastructure;
 
-namespace Microsoft.AspNetCore.Authentication.Twitter
+namespace Microsoft.AspNetCore.Authentication.Twitter.Internal
 {
-    internal class TwitterConfigureOptions : ConfigureDefaultOptions<TwitterOptions>
+    public class TwitterConfigureOptions : ConfigureDefaultOptions<TwitterOptions>
     {
         // Bind to "Twitter" section by default
         public TwitterConfigureOptions(IConfiguration config) :
diff --git a/src/Microsoft.AspNetCore.Authentication.Twitter/TwitterExtensions.cs b/src/Microsoft.AspNetCore.Authentication.Twitter/TwitterExtensions.cs
index 11586f9844..dac9ee3512 100644
--- a/src/Microsoft.AspNetCore.Authentication.Twitter/TwitterExtensions.cs
+++ b/src/Microsoft.AspNetCore.Authentication.Twitter/TwitterExtensions.cs
@@ -3,6 +3,7 @@
 
 using System;
 using Microsoft.AspNetCore.Authentication.Twitter;
+using Microsoft.AspNetCore.Authentication.Twitter.Internal;
 using Microsoft.Extensions.DependencyInjection.Extensions;
 using Microsoft.Extensions.Options;
 using Microsoft.Extensions.Options.Infrastructure;
@@ -19,7 +20,7 @@ namespace Microsoft.Extensions.DependencyInjection
 
         public static IServiceCollection AddTwitterAuthentication(this IServiceCollection services, string authenticationScheme, Action<TwitterOptions> configureOptions)
         {
-            services.TryAddEnumerable(ServiceDescriptor.Singleton<IInitializeOptions<TwitterOptions>, TwitterInitializer>());
+            services.TryAddEnumerable(ServiceDescriptor.Singleton<IPostConfigureOptions<TwitterOptions>, TwitterPostConfigureOptions>());
             services.AddSingleton<ConfigureDefaultOptions<TwitterOptions>, TwitterConfigureOptions>();
             return services.AddRemoteScheme<TwitterOptions, TwitterHandler>(authenticationScheme, authenticationScheme, configureOptions);
         }
diff --git a/src/Microsoft.AspNetCore.Authentication.Twitter/TwitterInitializer.cs b/src/Microsoft.AspNetCore.Authentication.Twitter/TwitterPostConfigureOptions.cs
similarity index 81%
rename from src/Microsoft.AspNetCore.Authentication.Twitter/TwitterInitializer.cs
rename to src/Microsoft.AspNetCore.Authentication.Twitter/TwitterPostConfigureOptions.cs
index 08e9c5b832..09db5699f9 100644
--- a/src/Microsoft.AspNetCore.Authentication.Twitter/TwitterInitializer.cs
+++ b/src/Microsoft.AspNetCore.Authentication.Twitter/TwitterPostConfigureOptions.cs
@@ -10,21 +10,21 @@ namespace Microsoft.AspNetCore.Authentication.Twitter
     /// <summary>
     /// Used to setup defaults for all <see cref="TwitterOptions"/>.
     /// </summary>
-    public class TwitterInitializer : IInitializeOptions<TwitterOptions>
+    public class TwitterPostConfigureOptions : IPostConfigureOptions<TwitterOptions>
     {
         private readonly IDataProtectionProvider _dp;
 
-        public TwitterInitializer(IDataProtectionProvider dataProtection)
+        public TwitterPostConfigureOptions(IDataProtectionProvider dataProtection)
         {
             _dp = dataProtection;
         }
 
         /// <summary>
-        /// Invoked to initialize a TOptions instance.
+        /// Invoked to post configure a TOptions instance.
         /// </summary>
-        /// <param name="name">The name of the options instance being initialized.</param>
-        /// <param name="options">The options instance to initialize.</param>
-        public void Initialize(string name, TwitterOptions options)
+        /// <param name="name">The name of the options instance being configured.</param>
+        /// <param name="options">The options instance to configure.</param>
+        public void PostConfigure(string name, TwitterOptions options)
         {
             options.DataProtectionProvider = options.DataProtectionProvider ?? _dp;
 
diff --git a/src/Microsoft.AspNetCore.Authentication/AuthenticationSchemeOptions.cs b/src/Microsoft.AspNetCore.Authentication/AuthenticationSchemeOptions.cs
index 55bc09d8ae..0e86b3a9ff 100644
--- a/src/Microsoft.AspNetCore.Authentication/AuthenticationSchemeOptions.cs
+++ b/src/Microsoft.AspNetCore.Authentication/AuthenticationSchemeOptions.cs
@@ -2,18 +2,9 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using Microsoft.Extensions.Options;
 
 namespace Microsoft.AspNetCore.Authentication
 {
-    public class InitializeAuthenticationSchemeOptions<TOptions> : InitializeOptions<TOptions>
-        where TOptions : AuthenticationSchemeOptions
-    {
-        public InitializeAuthenticationSchemeOptions(string name) 
-            : base(name, options => options.ClaimsIssuer = options.ClaimsIssuer ?? name)
-        { }
-    }
-
     /// <summary>
     /// Contains the options used by the <see cref="AuthenticationHandler{T}"/>.
     /// </summary>
diff --git a/src/Microsoft.AspNetCore.Authentication/AuthenticationServiceCollectionExtensions.cs b/src/Microsoft.AspNetCore.Authentication/AuthenticationServiceCollectionExtensions.cs
index ff367f5557..7ebc979f1b 100644
--- a/src/Microsoft.AspNetCore.Authentication/AuthenticationServiceCollectionExtensions.cs
+++ b/src/Microsoft.AspNetCore.Authentication/AuthenticationServiceCollectionExtensions.cs
@@ -2,9 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
-using System.Collections.Generic;
 using Microsoft.AspNetCore.Authentication;
-using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.DependencyInjection.Extensions;
 using Microsoft.Extensions.Options;
 
@@ -79,12 +77,12 @@ namespace Microsoft.Extensions.DependencyInjection
             where TOptions : RemoteAuthenticationOptions, new()
             where THandler : RemoteAuthenticationHandler<TOptions>
         {
-            services.TryAddEnumerable(ServiceDescriptor.Singleton<IInitializeOptions<TOptions>, EnsureSignInScheme<TOptions>>());
+            services.TryAddEnumerable(ServiceDescriptor.Singleton<IPostConfigureOptions<TOptions>, EnsureSignInScheme<TOptions>>());
             return services.AddScheme<TOptions, THandler>(authenticationScheme, displayName, configureScheme: null, configureOptions: configureOptions);
         }
 
         // Used to ensure that there's always a default data protection provider
-        private class EnsureSignInScheme<TOptions> : IInitializeOptions<TOptions> where TOptions : RemoteAuthenticationOptions
+        private class EnsureSignInScheme<TOptions> : IPostConfigureOptions<TOptions> where TOptions : RemoteAuthenticationOptions
         {
             private readonly AuthenticationOptions _authOptions;
 
@@ -93,7 +91,7 @@ namespace Microsoft.Extensions.DependencyInjection
                 _authOptions = authOptions.Value;
             }
 
-            public void Initialize(string name, TOptions options)
+            public void PostConfigure(string name, TOptions options)
             {
                 options.SignInScheme = options.SignInScheme ?? _authOptions.DefaultSignInScheme;
             }