diff --git a/20.what-is-the-roles.md b/20.what-is-the-roles.md
index 52cb858..b4ba10d 100644
--- a/20.what-is-the-roles.md
+++ b/20.what-is-the-roles.md
@@ -78,6 +78,7 @@ $ tree .
 - [PyPI - the Python Package Index | Python][pypi]
 - [Python Tutorial 第二堂（3）函式、模組、類別與套件 by caterpillar | CodeData][python_package]
 - [現代 IT 人一定要知道的 Ansible 自動化組態技巧 Ⅱ - Roles & Windows | 凍仁的筆記][automate-with-ansible-roles-windows]
+- [Ansible Roles : Basics & How to Combine Them With Playbooks | Spacelift](https://spacelift.io/blog/ansible-roles)
 
 [pypi]: https://pypi.python.org/pypi
 [python_package]: http://www.codedata.com.tw/python/python-tutorial-the-2nd-class-3-function-module-class-package/