diff --git a/.hgtags b/.hgtags
index a6416ae92..0f4c41ed0 100644
--- a/.hgtags
+++ b/.hgtags
@@ -2,3 +2,4 @@ b0ff0d52ef89bcd27be9e3cd9e088d92c733a7e7 milestone_2
 d3a37950495c55c255699400edd5930538cbacb4 milestone_3
 8227ce764d491a942389f7a9f654f69d2701cb12 milestone_4
 bda291e79a4f4cd282b67552e56dad9935bd4018 mileston_4_1
+0000000000000000000000000000000000000000 mileston_4_1