small update README.md

diff --git a/README.md b/README.md
index ec848848e00212c0894744dee101b12459cefee8..a34180013caf6d72af270bd7bb74d23bdd43553d 100644 (file)
--- a/README.md
+++ b/README.md
@@ -33,7 +33,7 @@ New feature of version 6.5.0
 * NEW: \R (general newline) \N (no newline)
 * NEW: \O (true anychar)
 * NEW: if-then-else syntax   (?(...)...\|...)
-* NEW: Backreference validity checker  (*original)
+* NEW: Backreference validity checker (?(xxx)) (*original)
 * NEW: Absent repeater (?~absent)
 * NEW: Absent expression   (?~|absent|expr)  (*original)
 * NEW: Absent range cutter (?~|absent)     (*original)