diff --git a/config/set/php85.php b/config/set/php85.php
index 37449b68b95..adccac201f2 100644
--- a/config/set/php85.php
+++ b/config/set/php85.php
@@ -22,6 +22,7 @@
     $rectorConfig->ruleWithConfiguration(
         RemoveFuncCallArgRector::class,
         [
+            // https://wiki.php.net/rfc/deprecations_php_8_5#deprecate_key_length_parameter_of_openssl_pkey_derive
             new RemoveFuncCallArg('openssl_pkey_derive', 2),
             // https://wiki.php.net/rfc/deprecations_php_8_5#deprecate_the_exclude_disabled_parameter_of_get_defined_functions
             new RemoveFuncCallArg('get_defined_functions', 0),