diff --git a/changes/ce/feat-12499.en.md b/changes/ce/feat-12499.en.md
index 2649e3cd2..8724b66e7 100644
--- a/changes/ce/feat-12499.en.md
+++ b/changes/ce/feat-12499.en.md
@@ -3,3 +3,5 @@ Added ability to ban clients by extended rules:
 * by matching client's `username` to a regular expression;
 * by matching client's peer address to an CIDR range.
 
+Warning: large number of matching rules (not tied to a concrete clientid, username or host) will impact performance.
+