Internal Comments is a plugin that lets you post admin-facing comments that are only visible to users with admin-area access on any registered post type.
After selecting the post types that support internal comments in the plugin’s settings, a new metabox will appear on the edit screen of posts belonging to those post types. Users with appropriate permissions will now be able to post new internal comments.
Here is a short overview of the features offered by this plugin:
Some of the features mentioned above are only bundled with the premium version of our plugin available here. It is perfectly possible, however, to use the free version and extend it via filters and actions with your own version of the same premium features.
Premium customers are also entitled to prioritized help and support through our support forum.