Make explanation more clear

README.md

@@ -152,7 +152,7 @@ lesson _(3.3)_**.
 | Initial assumption | A user, who is logged-in on Ettore and has the "student" role, wishes to apply for joining a new course that he/she has already found in the search page                                                                                                                                                                     |
 |--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
 | Normal functioning | The student, having found the course of interest with the search functionality, clicks the "Join" button. Once the enrollment request has been made, the student will be redirected to his list of joined courses but that doesn't include the wanted course just yet: the join request has to be accepted by the professor. |
-| What can go wrong  | The "Join" button is disabled, this means that the request for enrollment in the course has already been submitted or the student is already enrolled in the coures. The student can do nothing but wait for feedback from the professor.                                                                                    |
+| What can go wrong  | The "Join" button is disabled, this means that the request for enrollment in the course has already been submitted or the student is already enrolled in the course. In the former case, the student can do nothing but wait for feedback from the professor.                                                                |
 | Other activities   | -                                                                                                                                                                                                                                                                                                                            |
 | Final system state | The course is linked to a new enrollment request from the student who performed the action.                                                                                                                                                                                                                                  |