diff --git a/types/koa/index.d.ts b/types/koa/index.d.ts
index d46920bf07..d4f339aa32 100644
--- a/types/koa/index.d.ts
+++ b/types/koa/index.d.ts
@@ -136,6 +136,11 @@ declare interface ContextDelegatedRequest {
      */
     secure: boolean;
 
+    /**
+     * Request remote address. Supports X-Forwarded-For when app.proxy is true.
+     */
+    ip: string;
+
     /**
      * When `app.proxy` is `true`, parse
      * the "X-Forwarded-For" ip address list.