diff --git a/docs/guide/structure-extensions.md b/docs/guide/structure-extensions.md
index 6930795164..e9d84f0e29 100644
--- a/docs/guide/structure-extensions.md
+++ b/docs/guide/structure-extensions.md
@@ -2,7 +2,7 @@ Extensions
 ==========
 
 Extensions are redistributable software packages specifically designed to be used in Yii applications and provide
-ready-to-use features. For example, the [yiisoft/yii2-debug](tool-debugger.md) extension adds a handy debug toolbar
+ready-to-use features. For example, the [yiisoft/yii2-debug](https://github.com/yiisoft/yii2-debug) extension adds a handy debug toolbar
 at the bottom of every page in your application to help you more easily grasp how the pages are generated. You can
 use extensions to accelerate your development process. You can also package your code as extensions to share with
 other people your great work.