diff --git a/ResponseCode.h b/ResponseCode.h
index a858b99..402e35b 100644
--- a/ResponseCode.h
+++ b/ResponseCode.h
@@ -48,6 +48,7 @@
     // action did not take place.
     static const int CommandSyntaxError = 500;
     static const int CommandParameterError = 501;
+    static const int CommandNoPermission = 502;
 
     // 600 series - Unsolicited broadcasts
     static const int UnsolicitedInformational       = 600;