diff --git a/opm/core/simulator/BlackoilState.cpp b/opm/core/simulator/BlackoilState.cpp
index b210af6e5..ee16c196f 100644
--- a/opm/core/simulator/BlackoilState.cpp
+++ b/opm/core/simulator/BlackoilState.cpp
@@ -12,7 +12,7 @@ BlackoilState::init(int number_of_cells, int number_of_phases, int num_phases)
    gorId_ = SimulatorState::registerCellData( "GASOILRATIO", 1 );
    rvId_  = SimulatorState::registerCellData( "RV", 1 );
 
-   // surfvol_ intentionally empty, left to initBlackoilSurfvol
+   // surfvolumes intentionally empty, left to initBlackoilSurfvol
    surfaceVolId_ = SimulatorState::registerCellData( "SURFACEVOL", 0 );
 }
 
diff --git a/opm/core/simulator/BlackoilState.hpp b/opm/core/simulator/BlackoilState.hpp
index c5c6bdab6..b6622e198 100644
--- a/opm/core/simulator/BlackoilState.hpp
+++ b/opm/core/simulator/BlackoilState.hpp
@@ -1,5 +1,6 @@
 /*
   Copyright 2012 SINTEF ICT, Applied Mathematics.
+  Copyright 2015 IRIS AS
 
   This file is part of the Open Porous Media project (OPM).