Added comments

git-svn-id: https://redmine.imt-atlantique.fr/svn/xaal/code/Python/trunk@2097 b32b6428-25c9-4566-ad07-03861ab6144f

libs/lib/xaal/lib/core.py

@@ -239,6 +239,11 @@ class Engine(object):
     # timers
     #####################################################
     def add_timer(self,func,period,repeat=-1):
+        """ 
+        func: function to call
+        period: period in second
+        repeat: number of repeat, -1 => always
+        """
         t = Timer(func,period,repeat)
         self.timers.append(t)