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+# 🧩 Plugins
+The bot supports loading external plugins.
+
+## Specifying plugins to load
+For each plugin file you'd like to load, add the file path to the [`plugins` option](configuration.md#plugins).
+The path is relative to the bot's folder.
+Plugins are automatically loaded on bot startup.
+
+## Creating a plugin
+Create a `.js` file that exports a function.
+This function will be called when the plugin is loaded, with 1 argument: an object that has the following properties:
+* `bot` - the [Eris Client object](https://abal.moe/Eris/docs/Client)
+* `knex` - the [Knex database object](https://knexjs.org/#Builder)
+* `config` - the loaded config
+* `commands` - an object with functions to add and manage commands
+* `attachments` - an object with functions to save attachments and manage attachment storage types
+
+See [src/plugins.js#L4](../src/plugins.js#L4) for more details
+
+### Example plugin file
+This example adds a command `!mycommand` that replies with `"Reply from my custom plugin!"` when the command is used inside a modmail inbox thread channel.
+```js
+module.exports = function({ bot, knex, config, commands }) {
+  commands.addInboxThreadCommand('mycommand', [], (msg, args, thread) => {
+    thread.replyToUser(msg.author, 'Reply from my custom plugin!');
+  });
+}
+```
+
+(Note the use of [object destructuring](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment#Unpacking_fields_from_objects_passed_as_function_parameter) in the function parameters)
+
+### Example of a custom attachment storage type
+This example adds a custom type for the `attachmentStorage` option called `"original"` that simply returns the original attachment URL without rehosting it in any way.
+```js
+module.exports = function({ attachments }) {
+  attachments.addStorageType('original', attachment => {
+    return { url: attachment.url };
+  });
+};
+```
+To use this custom attachment storage type, you would set the `attachmentStorage` config option to `"original"`.
+
+## Work in progress
+The current plugin API is fairly rudimentary and will be expanded on in the future.
+The API can change in non-major releases during this early stage. Keep an eye on [CHANGELOG.md](../CHANGELOG.md) for any changes.
+
+Please send any feature suggestions to the [issue tracker](https://github.com/Dragory/modmailbot/issues)!