diff --git a/src/tools/copyright.pl b/src/tools/copyright.pl
index d78a8d8ce8..b8b87613f8 100755
--- a/src/tools/copyright.pl
+++ b/src/tools/copyright.pl
@@ -51,5 +51,6 @@ sub wanted {
     untie @lines;
 }
 
-print "Manually update doc/src/sgml/legal.sgml and src/interfaces/libpq/libpq.rc.in too\n";
+print "Manually update doc/src/sgml/legal.sgml and src/interfaces/libpq/libpq.rc.in too.\n";
+print "Also update ./COPYRIGHT and doc/src/sgml/legal.sgml in all back branches.\n";