bcd2dec: Note where we got it from

diff --git a/bcd2dec.s b/bcd2dec.s
index 5ef08e25c42e659ab9da4a870dc7ca822611ffae..30566936d78b8b45c7ac1d73b6c012e85e570954 100644 (file)
--- a/bcd2dec.s
+++ b/bcd2dec.s
@@ -4,6 +4,8 @@
 
 .code
 
+;; Copied from [cc65]/libsrc/c128/systime.s
+
 .proc   _bcd2dec
         tax
         and     #%00001111