Index: trunk/MagicSoft/include-Classes/MMcFormat/MMcRunHeader.cxx
===================================================================
--- trunk/MagicSoft/include-Classes/MMcFormat/MMcRunHeader.cxx	(revision 1301)
+++ trunk/MagicSoft/include-Classes/MMcFormat/MMcRunHeader.cxx	(revision 1312)
@@ -28,4 +28,25 @@
 //
 // Root storage container for the RUN MONTE CARLO HEADER information
+//
+// This the second version of this output class. Old root files, which have
+// a previous version of this class, are still compatibles and can be used.
+// But of course, you can no try to get infromatino in these old files about
+// the new data members.
+//
+// The following data member have been introduced in this second version 
+// and they do not exist in the previous one:
+//
+//  Float_t fMcRunNumber;      Run Number
+//  UInt_t  fProductionSite;   code to know where the run was generated
+//  Float_t fDateRunMMCs;      Date of the MMCs production
+//  Float_t fDateRunCamera;    Date, when the Camera program is run.
+//  Byte_t  fRawEvt;           RawEvt[Data,Hedaer] stored or not
+//  Byte_t  fElecNoise;        Electronic Noise simulated or not
+//  Byte_t  fStarFieldRotate;  Is the starfield rotation switched on (1) or off (0)
+//  Float_t fCWaveLower;       Wavelength limits for the Cerenkov photons
+//  Float_t fCWaveUpper;
+//  UInt_t    fNumObsLev;      Observation levels  
+//  Float_t   fHeightLev[10]; 
+//  Float_t   fSlopeSpec;      Spectral index
 //
 ////////////////////////////////////////////////////////////////////////////