add description about \X

diff --git a/README.md b/README.md
index cec6e6e5d85965afdb33f3a28d742bceee78a347..5f63aa5e7ab633cea1b870ab77ebd9ee13696fce 100644 (file)
--- a/README.md
+++ b/README.md
@@ -31,6 +31,7 @@ New feature of version 6.6.0
 
 * NEW: ASCII only mode options for character type/property (?WDSP)
 * NEW: \y, \Y  Extended Grapheme Cluster boundary (*original)
+* NEW: \X  Extended Grapheme Cluster
 * Absent-clear operator restores previous range in backtrack.