diff --git a/.hgtags b/.hgtags
index 06d289325d6be8cc12b23f01fdfc4b7ab72d9e13..ea43dd32fc55c49a7bc5c0bd9a8465fbf9bd5329 100755
--- a/.hgtags
+++ b/.hgtags
@@ -541,3 +541,4 @@ ad0e15543836d64d6399d28b32852510435e344a 5.1.0-release
 ac3b1332ad4f55b7182a8cbcc1254535a0069f75 5.1.7-release
 23ea0fe36fadf009a60c080392ce80e4bf8af8d9 5.1.8-release
 52422540bfe54b71155aa455360bee6e3ef1fd96 5.1.9-release
+1cfa567caf5088ae299271be08cc2d9f0801ff6a pre-Poseidon