diff --git a/src/Servers/Kestrel/Core/src/Internal/Infrastructure/KestrelTrace.cs b/src/Servers/Kestrel/Core/src/Internal/Infrastructure/KestrelTrace.cs
index c44b84cc0a..4e00c55793 100644
--- a/src/Servers/Kestrel/Core/src/Internal/Infrastructure/KestrelTrace.cs
+++ b/src/Servers/Kestrel/Core/src/Internal/Infrastructure/KestrelTrace.cs
@@ -49,7 +49,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Infrastructure
             LoggerMessage.Define(LogLevel.Debug, new EventId(21, nameof(NotAllConnectionsAborted)), "Some connections failed to abort during server shutdown.");
 
         private static readonly Action<ILogger, TimeSpan, DateTimeOffset, Exception> _heartbeatSlow =
-            LoggerMessage.Define<TimeSpan, DateTimeOffset>(LogLevel.Warning, new EventId(22, nameof(HeartbeatSlow)), @"Heartbeat took longer than ""{interval}"" at ""{now}"".");
+            LoggerMessage.Define<TimeSpan, DateTimeOffset>(LogLevel.Warning, new EventId(22, nameof(HeartbeatSlow)), @"Heartbeat took longer than ""{interval}"" at ""{now}"". This could be caused by thread pool starvation.");
 
         private static readonly Action<ILogger, string, Exception> _applicationNeverCompleted =
             LoggerMessage.Define<string>(LogLevel.Critical, new EventId(23, nameof(ApplicationNeverCompleted)), @"Connection id ""{ConnectionId}"" application never completed");