diff --git a/source/_posts/make-hexo-blog-smaller.md b/source/_posts/make-hexo-blog-smaller.md
index 46e554a..e35aa22 100644
--- a/source/_posts/make-hexo-blog-smaller.md
+++ b/source/_posts/make-hexo-blog-smaller.md
@@ -14,6 +14,7 @@ In Hexo, there are two approaches.
     ``` bash
     $ npm install hexo-all-minifier --save
     ```
+2. If there is any error during installation, run `$ sudo apt install libpng-dev` and `node node_modules/optipng-bin/lib/install.js`.
 2. Above command will add hexo-all-minifer to your `package.json` and install it.
 3. To enable it, put `all_minifier: true` line at `_config.yml`.
 4. Deploy.