diff --git a/README.md b/README.md
index 0815b74..1162e6d 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ React state management library based on global variables and react hooks.
 - Support selecting deeply nested state
 - Support creating global state dynamically
 - Support both key based and non-key based global state
-- States are stored as global variables(They can be used anywhere)
+- States are stored as global variables(Can be used anywhere)
 
 <br/>
 
diff --git a/src/hooks/useGlobalStateReducer.js b/src/hooks/useGlobalStateReducer.js
index 5c7d9d9..e27b8ab 100644
--- a/src/hooks/useGlobalStateReducer.js
+++ b/src/hooks/useGlobalStateReducer.js
@@ -42,11 +42,12 @@ function useGlobalStateReducer(reducer, globalState, config = {}) {
     useEffect(() => {
         globalState.subscribe(observer);
         isMounted.current = true;
+
         return () => {
             globalState.unsubscribe(observer);
             isMounted.current = false;
         }
-    })
+    }, [])
 
     function dispatch(action) {
         const newState = reducer(globalState.getValue(), action);