Clarify README.

Author: m-raafat-abdelkader

README.md

@@ -49,9 +49,11 @@ a database using the following SQL command:
 Due to the nature of the information returned by these functions, access is
 restricted to superusers and members of the monitor_system_stats role which
 will be created when the extension is installed. monitor_system_stats role
-will not be removed during drop extension. To allow users to access
-the functions without granting them superuser access, add them to the
-monitor_system_stats role. For example:
+will not be removed when you run DROP EXTENSION. This means that any users
+or roles that were granted permissions to the monitor_system_stats role 
+will still have those permissions even after the extension has been dropped. 
+To allow users to access the functions without granting them superuser access, 
+add them to the monitor_system_stats role. For example:
 
     GRANT monitor_system_stats to nagios;