diff --git a/User-guide.md b/User-guide.md
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@@ -1,5 +1,21 @@
 # SWAD user guide
 
+## Roles
+
+Each user has a role of student or teacher at each of the courses in which he/she is enrolled. In addition, some users may be administrators.
+
+These are all available roles:
+
+0. _Unknown_: User not logged in
+1. _Guest_: User not belonging to any course
+2. _Visitor_: Student or teacher in other courses but not belonging to the current course
+3. _Student_: Student in current course
+4. _Teacher_: Teacher in current course
+5. _Degree admin_: Degree administrator
+6. _Centre admin_: Centre administrator
+7. _Institution admin_: Institution administrator
+8. _System admin_: System administrator (superuser)
+
 ## Tabs and options inside tabs
 
 The functionalities of the SWAD platform are organized in several groups or **tabs**.