diff --git a/CHANGES.md b/CHANGES.md
index 3c9006e512..9c452570b5 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -32,6 +32,11 @@ OpenSSL 4.0
 
 ### Changes between 3.6 and 4.0 [xx XXX xxxx]
 
+ * various function parameters have been constified,
+   in particular for X509-related functions.
+
+   *David von Oheimb*
+
  * Added `-hmac-env` and `-hmac-stdin` options to openssl-dgst.
 
    *Igor Ustinov*