diff --git a/index.d.ts b/index.d.ts
index 3ddfa4e..3b0844b 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -58,7 +58,7 @@ declare namespace bearerToken {
          * Specify cookie options with key, AND if is signed, pass a secret.
          */
         cookie?: {
-            signed: boolean,
+            signed?: boolean,
             key: string,
             secret: string,
         };