diff --git a/index/README.txt b/index/README.txt
index 5aafa53..ff6c03d 100644
--- a/index/README.txt
+++ b/index/README.txt
@@ -2,6 +2,8 @@
 Indexed Collections for Various Purposes
 ========================================
 
+$Id$
+
 Multikey Dictionaries
 =====================