diff --git a/README.md b/README.md
index 9f2ad7d..95cea4a 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,7 @@ A cross-platform bridge that allows you to enable and disable the screen idle ti
 
 ## Install
 
-`npm install react-native-idle-timer@latest --save`
+`yarn add react-native-idle-timer`
 
 ## Link
 
diff --git a/index.d.ts b/index.d.ts
index a205369..2ff17ec 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1,4 +1,4 @@
 declare namespace RNIdleTimer {
-  function setIdleTimerDisabled(disabled: boolean, tag: string | undefined): void;
+  function setIdleTimerDisabled(disabled: boolean, tag?: string): void;
 }
-export = RNIdleTimer
+export = RNIdleTimer;