diff --git a/README.md b/README.md
index 1c71c05..59b47a3 100644
--- a/README.md
+++ b/README.md
@@ -574,7 +574,8 @@ TinySTL
 	assert(cp1 == cp2 && cp2 == cp3);
 	assert(*cp1 == *cp2 && *cp2 == *cp3 && *cp3 == "zouxiaohang");
 
-	*cp2;//read
+	string s = *cp2;//read
+	assert(s == "zouxiaohang");
 	assert(cp1 == cp2 && cp2 == cp3);
 	assert(*cp1 == *cp2 && *cp2 == *cp3 && *cp3 == "zouxiaohang");
 
diff --git a/TinySTL/COWPtr.h b/TinySTL/COWPtr.h
index 9b22626..d758e1b 100644
--- a/TinySTL/COWPtr.h
+++ b/TinySTL/COWPtr.h
@@ -24,6 +24,7 @@ namespace TinySTL{
 			cow_ptr<T> *cp_;
 		};
 	}
+	//未能完全模拟原生指针操作，只供参考，详情见单元测试
 	template<class T>
 	class cow_ptr{
 	public:
diff --git a/TinySTL/Test/COWPtrTest.cpp b/TinySTL/Test/COWPtrTest.cpp
index 4b711de..41bc178 100644
--- a/TinySTL/Test/COWPtrTest.cpp
+++ b/TinySTL/Test/COWPtrTest.cpp
@@ -33,7 +33,9 @@ namespace TinySTL{
 			assert(cp1 == cp2 && cp2 == cp3);
 			assert(*cp1 == *cp2 && *cp2 == *cp3 && *cp3 == "zouxiaohang");
 
-			*cp2;//read
+			//cp2->capacity(); change the cow_ptr -> 由于代理类代理的类型未知(T)造成的
+			string s = *cp2;//read
+			assert(s == "zouxiaohang");
 			assert(cp1 == cp2 && cp2 == cp3);
 			assert(*cp1 == *cp2 && *cp2 == *cp3 && *cp3 == "zouxiaohang");