Github更换CNAME解析

今天整理 Github 的邮件，发现一个惊喜：
The page build completed successfully, but returned the following warning:
Your site’s DNS settings are using a custom subdomain, xxx.christen.cn, that’s set up as an A record. We recommend you change this to a CNAME record pointing at hiclick.github.io. Instructions on configuring a subdomain for use with GitHub Pages can be found at: https://help.github.com/articles/setting-up-a-custom-domain-with-github-pages/
For information on troubleshooting Jekyll see:
https://help.github.com/articles/using-jekyll-with-pages#troubleshooting

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最初添加解析的时候，我对A记录到一个固定的IP，就心存顾虑，今天释然。