--- a/mercurial/help/config.txt	Thu Apr 16 05:41:07 2015 -0400
+++ b/mercurial/help/config.txt	Thu Apr 16 05:36:49 2015 -0400
@@ -833,6 +833,10 @@
   after the lock is released. see ``pretxnclose`` docs for details about
   available variables.
 
+``txnabort``
+  Run when a transaction is aborted. see ``pretxnclose`` docs for details about
+  available variables.
+
 ``pretxnchangegroup``
   Run after a changegroup has been added via push, pull or unbundle,
   but before the transaction has been committed. Changegroup is