release-0.8.21 tag
diff --git a/.hgtags b/.hgtags
index f6e02c4..2d8a906 100644
--- a/.hgtags
+++ b/.hgtags
@@ -267,3 +267,4 @@
 7aaa959da85e09e29bcac3b1cadec35b0a25b64d release-0.8.18
 4bc73c644329a510da4e96b7241b80ead7772f83 release-0.8.19
 ea3d168fb99c32a5c3545717ecc61e85a375e5dd release-0.8.20
+27951ca037e63dae45ff5b6279124c224ae1255a release-0.8.21