Update mod-manager.rst

Author: realSquidCoder

docs/gui/mod-manager.rst

@@ -6,12 +6,28 @@ gui/mod-manager
     :tags: dfhack interface
 
 In a loaded world, shows a list of active mods with the ability to copy to clipboard.
-Adds an optional overlay to the mod list screen that allows you to save and
-load mod list presets, as well as set a default mod list preset for new worlds.
+
 
 Usage
 -----
 
 ::
 
     gui/mod-manager
+
+Overlay
+-------
+
+This tool also provides one overlay that is managed by the `overlay`
+framework.
+
+gui/mod-manager.button
+~~~~~~~~~~~~~~~~~~~~~~
+
+Adds an optional overlay to the mod list screen that allows you to save and
+load mod list presets, as well as set a default mod list preset for new worlds.
+
+gui/mod-manager.notification
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Displays a message when a mod preset has been auto-applied.