diff --git a/src/Microsoft.AspNet.WebUtilities/QueryBuilder.cs b/src/Microsoft.AspNet.WebUtilities/QueryBuilder.cs
index a719db536d..28cdfa85fe 100644
--- a/src/Microsoft.AspNet.WebUtilities/QueryBuilder.cs
+++ b/src/Microsoft.AspNet.WebUtilities/QueryBuilder.cs
@@ -14,16 +14,24 @@ namespace Microsoft.AspNet.WebUtilities
     {
         private IList<KeyValuePair<string, string>> _params;
 
-	    public QueryBuilder()
-	    {
+        public QueryBuilder()
+        {
             _params = new List<KeyValuePair<string, string>>();
-	    }
+        }
 
         public QueryBuilder(IEnumerable<KeyValuePair<string, string>> parameters)
         {
             _params = new List<KeyValuePair<string, string>>(parameters);
         }
 
+        public void Add(string key, IEnumerable<string> values)
+        {
+            foreach (var value in values)
+            {
+                _params.Add(new KeyValuePair<string, string>(key, value));
+            }
+        }
+
         public void Add(string key, string value)
         {
             _params.Add(new KeyValuePair<string, string>(key, value));
diff --git a/test/Microsoft.AspNet.WebUtilities.Tests/QueryBuilderTests.cs b/test/Microsoft.AspNet.WebUtilities.Tests/QueryBuilderTests.cs
index 2de60d8a46..76d3ac977d 100644
--- a/test/Microsoft.AspNet.WebUtilities.Tests/QueryBuilderTests.cs
+++ b/test/Microsoft.AspNet.WebUtilities.Tests/QueryBuilderTests.cs
@@ -50,6 +50,14 @@ namespace Microsoft.AspNet.WebUtilities
             Assert.Equal("?key1=value1&key2=value2&key3=value3", builder.ToString());
         }
 
+        [Fact]
+        public void AddIEnumerableValues_AddedInOrder()
+        {
+            var builder = new QueryBuilder();
+            builder.Add("key", new[] { "value1", "value2", "value3" });
+            Assert.Equal("?key=value1&key=value2&key=value3", builder.ToString());
+        }
+
         [Fact]
         public void AddMultipleValuesViaConstructor_AddedInOrder()
         {
@@ -73,5 +81,18 @@ namespace Microsoft.AspNet.WebUtilities
             };
             Assert.Equal("?key1=value1&key2=value2&key3=value3", builder.ToString());
         }
+
+        [Fact]
+        public void CopyViaConstructor_AddedInOrder()
+        {
+            var builder = new QueryBuilder()
+            {
+                { "key1", "value1" },
+                { "key2", "value2" },
+                { "key3", "value3" },
+            };
+            var builder1 = new QueryBuilder(builder);
+            Assert.Equal("?key1=value1&key2=value2&key3=value3", builder1.ToString());
+        }
     }
 }
\ No newline at end of file