diff --git a/regex/doc.go b/regex/doc.go
index 1c6d531..6a5d2c2 100644
--- a/regex/doc.go
+++ b/regex/doc.go
@@ -161,6 +161,7 @@ The following features from [regexp] are (currently) NOT supported:
  2. Negated POSIX classes
  3. Embedded flags (flags are instead passed as arguments to [Compile])
  4. Literal text with \Q ... \E
+ 5. Finite repetition with no start (defaulting at 0)
 
 The following features are not available in [regexp], but are supported in my engine:
  1. Lookarounds