Add clarifying comment about usage of custom rule

This should clear up questions like these: https://discourse.cakephp.org/t/rule-isunique-and-allowmultiplenulls/9004
cakephp · May 2, 2024 · 1f55ebd · 1f55ebd
1 parent 092b106
commit 1f55ebd
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diff --git a/en/orm/validation.rst b/en/orm/validation.rst
@@ -540,6 +540,7 @@ Creating Custom re-usable Rules
 
 You may want to re-use custom domain rules. You can do so by creating your own invokable rule::
 
+    // Using a custom rule of the application
     use App\ORM\Rule\IsUniqueWithNulls;
     // ...
     public function buildRules(RulesChecker $rules): RulesChecker