diff --git a/sw/tools/fp_lexer.mll b/sw/tools/fp_lexer.mll
index 4411639bc2..a73f13af02 100644
--- a/sw/tools/fp_lexer.mll
+++ b/sw/tools/fp_lexer.mll
@@ -1,3 +1,6 @@
+(* 
+   $Id$
+*)
 {
 open Fp_parser
 }