Improve clarity for multiple plugins in README

README.md

@@ -10,7 +10,7 @@ All Rack plugins are welcome assuming they
 
 ## For plugin developers: Adding/updating your plugin
 
-To add your plugin to the Plugin Manager, update its information, or inform us of a new build, please create an [issue](https://github.com/VCVRack/community/issues) with the title equal to your plugin slug(s).
+To add your plugin(s) to the Plugin Manager, update its information, or inform us of new builds, please create an [issue](https://github.com/VCVRack/community/issues) with the title equal to your plugin slug (or slugs, comma-separated).
 Give us each plugin name, your desired author name, license information, relevant URLs, and anything else under the *Manifest* section below.
 A Library Team member will handle your request.