diff --git a/fhem/FHEM/41_OREGON.pm b/fhem/FHEM/41_OREGON.pm
index 0840bc6d2..f5084572a 100755
--- a/fhem/FHEM/41_OREGON.pm
+++ b/fhem/FHEM/41_OREGON.pm
@@ -19,6 +19,7 @@
 #
 ##################################
 #
+# Most of the subs are copied and modified from xpl-perl 
 # from the following two files:
 #	xpl-perl/lib/xPL/Utils.pm:
 #	xpl-perl/lib/xPL/RF/Oregon.pm: