diff --git a/readme.md b/readme.md
index 0b73ebf..b6c6fdd 100644
--- a/readme.md
+++ b/readme.md
@@ -45,6 +45,9 @@ session.dispose();
 // returns time left before time out
 let timeLeft = session.getTimeLeft();
 
+// change the time span for idle
+session.updateTimeSpan(15 * 60 * 1000);
+
 ```
 
 By default the counter is automatically reset on those events:
diff --git a/src/services/IdleSessionTimeout.ts b/src/services/IdleSessionTimeout.ts
index 5c10903..31c3dc3 100644
--- a/src/services/IdleSessionTimeout.ts
+++ b/src/services/IdleSessionTimeout.ts
@@ -82,6 +82,11 @@ export class IdleSessionTimeout implements IIdleSessionTimeout {
       throw console.error("[idle-session-timeout] element is null or not defined");
     }
   }
+  
+  public updateTimeSpan = (timeSpan: number): void => {
+    this._timeSpan = timeSpan
+    this.reset()
+  }
 
   private _onTimeOut = (): void => {
     this.onTimeOut!();