diff --git a/asdf.lisp b/asdf.lisp
index a5743b415a1e43808befb706b985a66ff8e8119e..398b5a6824eff76151ada6afdb3d904ef37a9b95 100644
--- a/asdf.lisp
+++ b/asdf.lisp
@@ -1,3 +1,4 @@
+;;; $Format:%H$
 ;;; This is asdf: Another System Definition Facility. Revision: @@VERSION@@ 
 ;;;
 ;;; Feedback, bug reports, and patches are all welcome: please mail to