diff --git a/hgext/hooklib/changeset_obsoleted.py b/hgext/hooklib/changeset_obsoleted.py
--- a/hgext/hooklib/changeset_obsoleted.py
+++ b/hgext/hooklib/changeset_obsoleted.py
@@ -13,7 +13,7 @@
   messageidseed = myseed
 
   [hooks]
-  pretxnclose.changeset_obsoleted = \
+  txnclose.changeset_obsoleted = \
     python:hgext.hooklib.changeset_obsoleted.hook
 """