diff --git a/.hgtags b/.hgtags
--- a/.hgtags
+++ b/.hgtags
@@ -74,3 +74,4 @@ a18445b85d407294da0b7f1d8be3bedef5ffdea6
 19086c5de05f4984d7a90cd31624c45dd893f6bb 0.4.0
 da65398a62fff50f3d241796cbf17acdea2092ef 0.4.1
 bfa0b0a814644f0af3f492d17a9ed169cc3b89fe 0.5.0
+d01a8e92936dbd62c76505432f60efba432e9397 0.5.1