diff --git a/README.md b/README.md
index 7c116aa..c035ba6 100644
--- a/README.md
+++ b/README.md
@@ -1,42 +1,47 @@
 # MediaWiki Category Watcher
 
 Welcome in the MediaWiki Category Watcher! Another keep-it-simple-and-stupid watcher for your MediaWiki categories!
 
 This tool is useful to reiceive an email when a page is added to a category.
 
 ## Installation
 
+
+```
+sudo apt install php-net-smtp
+```
+
 ```
 git clone https://gitpull.it/source/mediawiki-category-watcher.git
 git clone https://gitpull.it/source/boz-mw.git
 ```
 
 Then:
 
 ```
 cd mediawiki-category-watcher
 cp config-example.php config.php
 ```
 
 Now fill your SMTP credentials in the `config.php` file.
 
 ## Usage
 
 ```
 ./watch.php --wiki=metawiki --strip-base --to=user@example.com,user2@example.com --category="Category:ItWikiCon 2020 - Proposals"
 ```
 
 ## Customize Email Body
 
 The `body.txt` file is just your email body, supporting this `sprintf` format:
 
 * `$1%s`: List of pages added inside the category.
 * `%2$s`: Watched category
 * `%3$s`: Watched category URL
 * `%4$s`: Your ORIGIN, set in the configuration
 
 ## License
 
 Copyright (c) 2020 Valerio Bozzolan
 
 This is a Free as in Freedom project. It comes with ABSOLUTELY NO WARRANTY. You are welcome to redistribute it under the terms of the GNU General Public License v3+.