diff --git a/src/appbar.cpp b/src/appbar.cpp
index 8d76148..acc2c3f 100644
--- a/src/appbar.cpp
+++ b/src/appbar.cpp
@@ -1,5 +1,6 @@
 /*
     Copyright 2016 Amebis
+    Based on code written by Jeffrey Richter.
 
     This file is part of wxExtend.