diff --git a/doc/TODO.md b/doc/TODO.md
index 49b55272..f26e1f4c 100644
--- a/doc/TODO.md
+++ b/doc/TODO.md
@@ -1,6 +1,6 @@
 ### protocol
 
-- 使用原生类型的hashmap，IntIntMap，IntLongMap，LongIntHashMap，LongLongHashMap
+- 使用primitive type原生类型的hashmap，IntIntMap，IntLongMap，LongIntHashMap，LongLongHashMap
 
 ### event