diff --git a/.hgtags b/.hgtags
index 08885ebd..42110711 100644
--- a/.hgtags
+++ b/.hgtags
@@ -91,3 +91,4 @@ fef6e5d66e2975132a0ca57ee663c0631c5580a8 RECOLL-1_05
 0f926dd325961e59c9620bd7584188d73564a36d RECOLL_1_15_1
 e294cf118a1d303b104d69276a6b135dd531fbc5 RECOLL_1_15_2
 5fc5a9f1024662b00cb14eaa46f6d946cbb152a4 RECOLL_1_15_3
+6411512e32046a5b36daa6aa6badc5d6fc6e5228 RECOLL_1_15_4