diff --git a/decltype/README.md b/decltype/README.md
index 07f9c37..4a8aa80 100644
--- a/decltype/README.md
+++ b/decltype/README.md
@@ -135,3 +135,4 @@ decltype(Func(1)) var13=true;//const bool
 decltype(i++) var14 = i;//int i++返回右值
 ```
 
+学习参考：https://www.cnblogs.com/QG-whz/p/4952980.html