diff --git a/src/csharp/GrpcCore/Internal/ServerWritingObserver.cs b/src/csharp/GrpcCore/Internal/ServerWritingObserver.cs
index e18eb9e9f17..2b46e9c53d6 100644
--- a/src/csharp/GrpcCore/Internal/ServerWritingObserver.cs
+++ b/src/csharp/GrpcCore/Internal/ServerWritingObserver.cs
@@ -3,6 +3,10 @@ using Google.GRPC.Core.Internal;
 
 namespace Google.GRPC.Core.Internal
 {
+    /// <summary>
+    /// Observer that writes all arriving messages to a call abstraction (in blocking fashion)
+    /// and then halfcloses the call. Used for server-side call handling.
+    /// </summary>
     internal class ServerWritingObserver<TWrite, TRead> : IObserver<TWrite>
 	{
         readonly AsyncCall<TWrite, TRead> call;