diff --git a/ai/trolly/trolly.h b/ai/trolly/trolly.h
index 6f07e9dcf9..b1a6ecce9d 100644
--- a/ai/trolly/trolly.h
+++ b/ai/trolly/trolly.h
@@ -1,3 +1,5 @@
+/* $Id$ */
+
 #ifndef AI_TROLLY_H
 #define AI_TROLLY_H