diff --git a/README.md b/README.md
index 942e42e..cd1f10a 100644
--- a/README.md
+++ b/README.md
@@ -170,7 +170,7 @@ int main(){
 - [x] 教练车牌
 - [ ] 武警车牌
 - [ ] 民航车牌
-- [ ] 双层黄牌
+- [x] 双层黄牌
 - [ ] 双层武警
 - [ ] 双层军牌
 - [ ] 双层农用车牌