Index: trunk/MagicSoft/Mars/mhist/MH.cc
===================================================================
--- trunk/MagicSoft/Mars/mhist/MH.cc	(revision 1388)
+++ trunk/MagicSoft/Mars/mhist/MH.cc	(revision 1389)
@@ -79,5 +79,8 @@
 // must overload this function. If it is not overloaded you cannot use
 // FillH with this class. The argument is a pointer to a container
-// in your paremeter list which is specified in the MFillH constructor
+// in your paremeter list which is specified in the MFillH constructor.
+// If you are not going to use it you should at least add
+//   Bool_t MH::Fill(const MParContainer *) { return kTRUE; }
+// to your class definition.
 //
 Bool_t MH::Fill(const MParContainer *par)