diff --git a/types/koa-session/index.d.ts b/types/koa-session/index.d.ts
index 2fe4a37b95..75721a5b2d 100644
--- a/types/koa-session/index.d.ts
+++ b/types/koa-session/index.d.ts
@@ -156,6 +156,11 @@ declare namespace session {
          */
         rolling?: boolean;
 
+        /**
+         * Renew session when session is nearly expired, so we can always keep user logged in. (default is false)
+         */
+        renew?: boolean;
+
         /**
          * You can store the session content in external stores(redis, mongodb or other DBs)
          */