diff --git a/Code/Mantid/Framework/API/inc/MantidAPI/Run.h b/Code/Mantid/Framework/API/inc/MantidAPI/Run.h
index 74e4494feb85efa0ec6e264f688a05706b34d35a..467826fb7ed0b5df80af93c03228faa8c2f45769 100644
--- a/Code/Mantid/Framework/API/inc/MantidAPI/Run.h
+++ b/Code/Mantid/Framework/API/inc/MantidAPI/Run.h
@@ -128,7 +128,9 @@ namespace Mantid
       //@}
 
     private:
+      /// The number of properties that are summed when two workspaces are summed
       static const int ADDABLES;
+      /// The names of the properties to summ when two workspaces are summed
       static const std::string ADDABLE[];
 
       /// A pointer to a property manager