diff --git a/lib/application.js b/lib/application.js
index 56cea8f..ddd50d2 100644
--- a/lib/application.js
+++ b/lib/application.js
@@ -100,7 +100,7 @@ module.exports = class Application extends Emitter {
 
   use(fn) {
     if (typeof fn !== 'function') throw new TypeError('middleware must be a function!');
-    if (isGeneratorFunction(fn)) throw new TypeError('Support for generators has been removed. See the documentation for examples of how to convert old middleware https://github.com/koajs/koa#example-with-old-signature');
+    if (isGeneratorFunction(fn)) throw new TypeError('Support for generators has been removed. See the documentation for examples of how to convert old middleware https://github.com/koajs/koa/tree/v2.x#old-signature-middleware-v1x');
     debug('use %s', fn._name || fn.name || '-');
     this.middleware.push(fn);
     return this;