add documentation

Author: maciacco

PWGLF/TableProducer/Nuspex/ebyeMaker.cxx

@@ -9,6 +9,10 @@
 // granted to it by virtue of its status as an Intergovernmental Organization
 // or submit itself to any jurisdiction.
 
+// \file ebyeMaker.cxx
+// \brief table producer for e-by-e analysis in LF
+// \author Mario Ciacco <mario.ciacco@cern.ch>
+
 #include <vector>
 #include <map>
 #include <utility>