diff --git a/LinearList/main.cpp b/LinearList/main.cpp
index 6976fac..1b866e3 100644
--- a/LinearList/main.cpp
+++ b/LinearList/main.cpp
@@ -7,7 +7,7 @@ ok	int capacity();
 ok	bool empty() const;//If empty, return 0;
 ok	int size() const; //Return Array Size
 ok	virtual T& get(int theIndex) const override; // Return Arr[theIndex]
-	virtual int indexOf(const T & theElement) const override; //Return the index of "theElement" first appeared
+ok	virtual int indexOf(const T & theElement) const override; //Return the index of "theElement" first appeared
 ok	virtual void erase(int theIndex) override; //Erase Arr[theIndex]
 ok	virtual T* changeLength(T * x, int oldlength, int newlength) override;
 ok	virtual void insert(int theIndex, const T & theElement) override; //Insert theElement to place Arr[theIndex]