diff --git a/shadowsocks-csharp/app.config b/shadowsocks-csharp/app.config
index d67d9c5f..d8ffbaca 100755
--- a/shadowsocks-csharp/app.config
+++ b/shadowsocks-csharp/app.config
@@ -39,7 +39,7 @@
       </setting>
     </Shadowsocks.Properties.Settings>
   </userSettings>
-  <!--
+  <!-- Uncomment to dump network tracing info
     <system.diagnostics>
     <sources>
       <source name="System.Net" tracemode="includehex" maxdatasize="1024">