This plugin acts as a sentinel that watches over your core WordPress programs (plus installed themes and plugins) and tells you when changes happen.
This causes the plugin to scan the WordPress install and track details on all files used by WordPress, as well as for all installed plugins and themes.
It is also possible to disable watching specific files. This is done in the detail view by clicking on the Eye Icon next to the filename. A crossed out Eye Icon will appear and the status will change to Not Watched. To enable watching on that file, just click on the crossed out Eye Icon.