diff --git a/types/types.d.ts b/types/types.d.ts
index e0dcd0d..89d1a7d 100644
--- a/types/types.d.ts
+++ b/types/types.d.ts
@@ -98,6 +98,9 @@ declare namespace fastifySession {
 
     /** checks if session has been modified since it was generated or loaded from the store. */
     isModified(): boolean;
+
+    /** checks if the session has been saved to the store */
+    isSaved(): boolean;
   }
 
   export interface SessionStore {
diff --git a/types/types.test-d.ts b/types/types.test-d.ts
index 9e5469b..3360525 100644
--- a/types/types.test-d.ts
+++ b/types/types.test-d.ts
@@ -118,6 +118,7 @@ app.route({
     expectType<string | undefined>(request.session.get('foo'))
     expectType<void>(request.session.touch())
     expectType<boolean>(request.session.isModified())
+    expectType<boolean>(request.session.isSaved())
     expectType<void>(request.session.reload(() => {}))
     expectType<void>(request.session.destroy(() => {}))
     expectType<void>(request.session.regenerate(() => {}))