diff --git a/src/Support/OperationExtensions/ErrorResponsesExtension.php b/src/Support/OperationExtensions/ErrorResponsesExtension.php
index de7cf3bf..92644f54 100644
--- a/src/Support/OperationExtensions/ErrorResponsesExtension.php
+++ b/src/Support/OperationExtensions/ErrorResponsesExtension.php
@@ -84,7 +84,10 @@ private function attachCustomRequestExceptions(FunctionType $methodType)
 
         $formRequest = $this->infer->analyzeClass($formRequest->name);
 
-        if ($formRequest->hasMethodDefinition('rules')) {
+        if (
+            $formRequest->hasMethodDefinition('rules')
+            || $formRequest->hasMethodDefinition('after')
+        ) {
             $methodType->exceptions = [
                 ...$methodType->exceptions,
                 new ObjectType(ValidationException::class),