- 'size' => the size of the avatar that will be looked up
- 'email' => email to look up the avatar for
- 'url' => the (string) generated URL of the avatar
-
-### 'emailer_send_prepare'
-'emailer_send_prepare' called from Emailer::send() before building the mime message.
-$b is an array, params to Emailer::send()
-
- 'fromName' => name of the sender
- 'fromEmail' => email fo the sender
- 'replyTo' => replyTo address to direct responses
- 'toEmail' => destination email address
- 'messageSubject' => subject of the message
- 'htmlVersion' => html version of the message
- 'textVersion' => text only version of the message
- 'additionalMailHeader' => additions to the smtp mail header
-
-### 'emailer_send'
-is called before calling PHP's mail().
-$b is an array, params to mail()
-
- 'to'
- 'subject'
- 'body'
- 'headers'
-
-### 'nav_info'
-is called after the navigational menu is build in include/nav.php.
-$b is an array containing $nav from nav.php.
-
-### 'template_vars'
-is called before vars are passed to the template engine to render the page.
+### avatar_lookup
+Called when looking up the avatar. `$b` is an array:
+
+- **size**: the size of the avatar that will be looked up
+- **email**: email to look up the avatar for
+- **url**: the (string) generated URL of the avatar
+
+### emailer_send_prepare
+Called from `Emailer::send()` before building the mime message.
+`$b` is an array of params to `Emailer::send()`.
+
+- **fromName**: name of the sender
+- **fromEmail**: email fo the sender
+- **replyTo**: replyTo address to direct responses
+- **toEmail**: destination email address
+- **messageSubject**: subject of the message
+- **htmlVersion**: html version of the message
+- **textVersion**: text only version of the message
+- **additionalMailHeader**: additions to the smtp mail header
+
+### emailer_send
+Called before calling PHP's `mail()`.
+`$b` is an array of params to `mail()`.
+
+- **to**
+- **subject**
+- **body**
+- **headers**
+
+### load_config
+Called during `App` initialization to allow addons to load their own configuration file(s) with `App::loadConfigFile()`.
+
+### nav_info
+Called after the navigational menu is build in `include/nav.php`.
+`$b` is an array containing `$nav` from `include/nav.php`.
+
+### template_vars
+Called before vars are passed to the template engine to render the page.