diff --git a/doc/advanced/customizing-gitea.en-us.md b/doc/advanced/customizing-gitea.en-us.md
index 69cf58b3..460ea61e 100644
--- a/doc/advanced/customizing-gitea.en-us.md
+++ b/doc/advanced/customizing-gitea.en-us.md
@@ -98,6 +98,20 @@ Apart from `extra_links.tmpl` and `extra_tabs.tmpl`, there are other useful temp
 - `body_outer_post.tmpl`, before the bottom `<footer>` element.
 - `footer.tmpl`, right before the end of the `<body>` tag, a good place for additional Javascript.
 
+## Customizing Gitea mails
+
+The `custom/templates/mail` folder allows changing the body of every mail of Gitea.
+Templates to override can be found in the
+[`templates/mail`](https://github.com/go-gitea/gitea/tree/master/templates/mail)
+directory of Gitea source.
+Override by making a copy of the file under `custom/templates/mail` using a
+full path structure matching source.
+
+Any statement contained inside `{{` and `}}` are Gitea's template
+syntax and shouldn't be touched without fully understanding these components.
+
+
+
 ## Adding Analytics to Gitea
 
 Google Analytics, Matomo (previously Piwik), and other analytics services can be added to Gitea. To add the tracking code, refer to the `Other additions to the page` section of this document, and add the JavaScript to the `custom/templates/custom/header.tmpl` file.
