diff --git a/packages/pub_sub/lib/src/isolate/shared.dart b/packages/pub_sub/lib/src/isolate/shared.dart
index d8f1728..9751b81 100644
--- a/packages/pub_sub/lib/src/isolate/shared.dart
+++ b/packages/pub_sub/lib/src/isolate/shared.dart
@@ -1,3 +1,5 @@
+/// A message handler class that handles the encoding/decoding of messages send
+/// between isolate [Client] and [Server].
 class MessageHandler {
   static const _requestId = 'request_id';
   static const _method = 'method';