diff --git a/.hgtags b/.hgtags
index b2cdb8e498f..9116bccd1c2 100644
--- a/.hgtags
+++ b/.hgtags
@@ -92,3 +92,4 @@ fa4630916699046357a5ac16884f3fc47bd0eaa6 v2.6.5rc2
 99af4b44e7e490390817a597a542546d749e698e v2.6.5
 c1dc9e7986a2a8e1070ec7bee748520febef382e v2.6.6rc1
 17d5b030e8779902d82f76ed32a69d8d5e71131a v2.6.6rc2
+0000000000000000000000000000000000000000 v2.6.6rc2