Small documentation change

sys/brathuhn.py

@@ -302,9 +302,12 @@ def callAt(func,_time,*args):
     guaranteed that it will happen after the specified time. The call happens
     in the same thread, so no synchronization is needed. You can append any 
     number of arguments you need. Returns the call id, needed to cancel a call
-
+    
+	E.g this will call foo(arg1,arg2) in ~5 seconds
+        brathuhn.callAt(foo,time.time()+5,arg1,arg2)
+	
     @param func -- Function to be called
-    @param time -- Message body"""
+    @param time -- The time when the message will be called"""
 	global call_ats
 	global call_ats_id
 	call_ats[call_ats_id]=[func,_time,args]