diff --git a/3 Hash Table/HashMap in Java.md b/3 Hash Table/HashMap in Java.md
index 1844f98..9c81564 100644
--- a/3 Hash Table/HashMap in Java.md	
+++ b/3 Hash Table/HashMap in Java.md	
@@ -1,4 +1,4 @@
 # HashMap in Java
 
-java 中 hashmap的实现原理
+java 中 hashmap的实现原理。
 
diff --git a/3 Hash Table/反向索引.md b/3 Hash Table/反向索引.md
deleted file mode 100644
index bb0e1a2..0000000
--- a/3 Hash Table/反向索引.md	
+++ /dev/null
@@ -1,10 +0,0 @@
-# 反向索引
-
-### 应用场景
-
-* ES
-* 推荐内容召回
-
-
-
-