-- The Ada programming language uses'--' to indicate a comment up to the end of the line.
--e.g:

  -- the air traffic controller task takes requests for takeoff and landing
   task type Controller (My_Runway: Runway_Access) is
      -- task entries for synchronous message passing
      entry Request_Takeoff (ID: in Airplane_ID; Takeoff: out Runway_Access);
      entry Request_Approach(ID: in Airplane_ID; Approach: out Runway_Access);
   end Controller;
APL