1 files changed, 1 insertions, 0 deletions

diff --git a/filter.c b/filter.c
index 0685f69b..788134a9 100644
--- a/filter.c
+++ b/filter.c
@@ -1,3 +1,4 @@
+static char rcsid[]="$Id$";
 /*
  * Copyright (C) 1996-8 Michael R. Elkins.
  *