diff --git a/helpers/make-tcltrf b/helpers/make-tcltrf
index 6e55bb9ba3a4dcf4fc01f733a3b4365fe5e6625b..19df1ac25a1264e5b67a7e00972f4411d3ed7a55 100644
--- a/helpers/make-tcltrf
+++ b/helpers/make-tcltrf
@@ -21,7 +21,8 @@ VERSION=1
 
 . ./config
 
-# Replace nonfree RIPEMD code with free code also included in Debian
+# Replace nonfree RIPEMD code with free code, also included in Debian
+# https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=751879
 rm -rf generic/ripemd/*
 cp $DATA/ripemd/* generic/ripemd