--- a/.hgtags
+++ b/.hgtags
@@ -2,3 +2,4 @@
 66a9a6f2024a7293ee82a98e54b0be0819e3f652 quaternion-2.0.1
 6fd92342f611f94bf59a8c131138c672c04fe2b4 quaternion-2.0.2
 ff0558c24732d7d5c3bb09e80c132432fb35d69e quaternion-2.0.3
+ad89b91004aecdff8d3b7f584a60968f6e745d56 quaternion-2.2.0