kc3-lang/md4c

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 295e84a..ef1cb39 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,10 @@ Fixes:
    Fix quadratic time behavior caused by one-by-one walking over block lines
    instead of calling `md_lookup_line()`.
 
+ - [#237](https://github.com/mity/md4c/issues/237):
+   Fix quadratic time and output size behavior caused by malicious misuse of
+   link reference definitions.
+
 
 ## Version 0.5.2