diff --git a/src/Nerdbank.Streams.Tests/MultiplexingStreamChannelOptionsTests.cs b/src/Nerdbank.Streams.Tests/MultiplexingStreamChannelOptionsTests.cs
index 082e5b09..a6cc5c19 100644
--- a/src/Nerdbank.Streams.Tests/MultiplexingStreamChannelOptionsTests.cs
+++ b/src/Nerdbank.Streams.Tests/MultiplexingStreamChannelOptionsTests.cs
@@ -73,7 +73,7 @@ public void ExistingPipe_DuplexPipe()
     }
 
     [Fact]
-    public void ExistingPipe_AcceptsHalfDuplex()
+    public void ExistingPipe_AcceptsSimplex()
     {
         var options = new MultiplexingStream.ChannelOptions();
 
diff --git a/src/Nerdbank.Streams/HalfDuplexStream.cs b/src/Nerdbank.Streams/HalfDuplexStream.cs
index a9bb4e66..9b94f545 100644
--- a/src/Nerdbank.Streams/HalfDuplexStream.cs
+++ b/src/Nerdbank.Streams/HalfDuplexStream.cs
@@ -17,6 +17,7 @@ namespace Nerdbank.Streams
     /// <summary>
     /// A <see cref="Stream"/> that acts as a queue for bytes, in that what gets written to it
     /// can then be read from it, in order.
+    /// This is actually a "simplex" stream -- not a half duplex stream. Naming bug.
     /// </summary>
     public class HalfDuplexStream : Stream, IBufferWriter<byte>, IDisposableObservable
     {