diff --git a/hotspot/.hgtags b/hotspot/.hgtags
index b4c3b90e4c2..bc44b8bd401 100644
--- a/hotspot/.hgtags
+++ b/hotspot/.hgtags
@@ -423,3 +423,4 @@ b14e7c0b7d3ec04127f565cda1d84122e205680c jdk9-b16
 871fd128548480095e0dc3fc34c422666baeec75 jdk9-b18
 d4cffb3ae6213c66c7522ebffe0349360a45f0ef jdk9-b19
 c1af79d122ec9f715fa29312b5e91763f3a4dfc4 jdk9-b20
+17b4a5e831b398738feedb0afe75245744510153 jdk9-b21