diff --git a/plugins/rpi/cpu_freq_1sec b/plugins/rpi/cpu_freq_1sec
index 384985c1..44e01214 100755
--- a/plugins/rpi/cpu_freq_1sec
+++ b/plugins/rpi/cpu_freq_1sec
@@ -1,4 +1,8 @@
 #! /bin/sh
+# 
+# This is a small supersampling plugin that does 
+# cpu sampling every 1 second.
+# 
 # (c) 2013 - LGPL - Steve Schnepp <steve.schnepp@pwkf.org>
 
 pluginfull="$0"                 # full name of plugin