diff --git a/lib/index.js b/lib/index.js
index 1919a207..d50ce898 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -70,7 +70,7 @@ p.parse =  function() {
   case UTF8.S:
     return this.parseS();
   default:
-    throw new Error("Unsupported message ID: " + Buffer([messageID]).toString('utf8'));
+    throw new Error("Unsupported message ID: " + Buffer([messageID]).toString('utf8') + " (" + messageID.toString(16) + ")");
   }
 };