diff --git a/docs/behavior-stricter-utf8-library.md b/docs/behavior-stricter-utf8-library.md
index 1a0f4d0..0fa1c4f 100644
--- a/docs/behavior-stricter-utf8-library.md
+++ b/docs/behavior-stricter-utf8-library.md
@@ -1,5 +1,7 @@
 # Stricter utf8 library validation
 
+**Status**: Implemented
+
 ## Summary
 
 `utf8.len` and other functions in UTF-8 library will do more rigorous validation of UTF-8 input, rejecting UTF-16 surrogates encoded into UTF-8.