diff --git a/mozilla/client.mk b/mozilla/client.mk
index d892743cf94..21b6d373522 100644
--- a/mozilla/client.mk
+++ b/mozilla/client.mk
@@ -52,7 +52,7 @@
 #
 # For branches, uncomment the MOZ_CO_TAG line with the proper tag,
 # and commit this file on that tag.
-#MOZ_CO_TAG = <tag>
+MOZ_CO_TAG = XBL_FORMS_20001013_BRANCH
 NSPR_CO_TAG = NSPRPUB_CLIENT_BRANCH
 PSM_CO_TAG = SECURITY_CLIENT_BRANCH
 LDAPCSDK_CO_TAG = LDAPCSDK_40_BRANCH