diff --git a/.hgtags b/.hgtags
--- a/.hgtags
+++ b/.hgtags
@@ -194,3 +194,4 @@ 4a8d9ed864754837a185a642170cde24392f9abf
 07e479ef7c9639be0029f00e6a722b96dcc05fee 5.0
 c3484ddbdb9621256d597ed86b90d229c59c2af9 5.0.1
 97ada9b8d51bef24c5cb4cdca4243f0db694ab6e 5.0.2
+e386b5f4f8360dbb43a576dd9b1368e386fefa5b 5.1rc0