diff --git a/index.js b/index.js
index e79609c..c35f7a4 100644
--- a/index.js
+++ b/index.js
@@ -180,6 +180,7 @@ module.exports = {
 		// '@typescript-eslint/prefer-interface': 'error',
 
 		'@typescript-eslint/prefer-namespace-keyword': 'error',
+		'@typescript-eslint/promise-function-async': 'error',
 		'@typescript-eslint/restrict-plus-operands': 'error',
 		'@typescript-eslint/type-annotation-spacing': 'error'
 	}