add receive notification to diagram class and use cases ?

Hello my friends , i need help , in class diagram i should add a notification classe to users car users recieve notification in my application (exemple when a client add a new project , the employee recieve a notification who tell that a client add a new project) so in diagram class i should add a class of notification a related to user class? also in use cases i shoult add a case of recieve notification for the acteur ??