diff --git a/.hgtags b/.hgtags
--- a/.hgtags
+++ b/.hgtags
@@ -46,3 +46,4 @@ cede47727a1b0867d19be1d168aceb00b5e74e3f
 8095aad89415099d8e1942a8e67050c22e111d8b v1.7.1
 66546e70973248de01601aa364eadf11dd2f3a9f v1.8.0
 c7d9ad82b374c2a20710eba8fa40a9b1472ddc77 v1.8.1
+f139e2153e0da5649558b1ed9369da860d442c0d v1.9.0-rc1