diff --git a/src/array/product-of-array-except-self.js b/src/array/product-of-array-except-self.js
index d57a1e7..bf61cc9 100644
--- a/src/array/product-of-array-except-self.js
+++ b/src/array/product-of-array-except-self.js
@@ -19,3 +19,5 @@ export const productExceptSelf = function (nums) {
 
   return ans
 }
+
+// 此算法效率不高，请勿仿照作者偷懒