diff --git a/index.d.ts b/index.d.ts
index 81df9958..133dab7b 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -154,6 +154,7 @@ declare namespace Router {
 
     reset(): void;
     prettyPrint(): string;
+    prettyPrint(opts: { commonPrefix?: boolean }): string;
 
     all: ShortHandRoute<V>;
 
diff --git a/test/types/router.test-d.ts b/test/types/router.test-d.ts
index 0c1f79f8..3d7a5500 100644
--- a/test/types/router.test-d.ts
+++ b/test/types/router.test-d.ts
@@ -58,6 +58,8 @@ let http2Res!: Http2ServerResponse;
 
   expectType<void>(router.reset())
   expectType<string>(router.prettyPrint())
+  expectType<string>(router.prettyPrint({ commonPrefix: false }))
+  expectType<string>(router.prettyPrint({ commonPrefix: true }))
 }
 
 // HTTP2