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+# THIRD-PARTY MODULES
+
+Many webtrees functions are provided by “modules”.
+Modules allows you to add additional features to webtrees and modify existing features.
+
+## Installing and uninstalling modules
+
+A module is a folder containing a file called `module.php`.
+There may be other files in the folder, such as CSS, JS, templates,
+languages, data, etc.
+
+To install a module, copy its folder to `/modules_v4`.
+
+To uninstall it, delete its folder from `/modules_v4`.
+
+Note that module names (i.e. the folder names) must not contain
+spaces or the characters `.`, `[` and `]`.  It must also have a
+maximum length of 30 characters.
+
+TIP: renaming a module from `<module>` to `<module.disable>`
+is a quick way to hide it from webtrees.  This works because
+modules containing `.` are ignored.
+
+## Writing modules
+
+To write a module, you need to understand the PHP programming language.
+
+There are several example modules available at
+https://github.com/webtrees
+
+The built-in modules can be found in `app/Module/`.
+These contain lots of useful examples that you can copy/paste.