diff --git a/src/TNL/Matrices/Matrix.h b/src/TNL/Matrices/Matrix.h
index 4fce8358d6f38221ff3b37cc878afa06739559c2..48e6ebf7c59ce87f9ebcbda9a24c8014fe394baf 100644
--- a/src/TNL/Matrices/Matrix.h
+++ b/src/TNL/Matrices/Matrix.h
@@ -84,16 +84,14 @@ public:
 
 
    // TODO: method for symmetric matrices, should not be in general Matrix interface
+   [[deprecated]]
    __cuda_callable__
    const IndexType& getNumberOfColors() const;
 
    // TODO: method for symmetric matrices, should not be in general Matrix interface
+   [[deprecated]]
    void computeColorsVector(Containers::Vector<Index, Device, Index> &colorsVector);
 
-   // TODO: what is this supposed to do?!?  There are redefinitions only in the
-   // EllpackSymmetricGraph and SlicedEllpackSymmetricGraph classes...
-   bool help( bool verbose = false ) { return true;};
-
    // TODO: copy should be done in the operator= and it should work the other way too
    void copyFromHostToCuda( Matrices::Matrix< Real, Devices::Host, Index >& matrix );
 
@@ -103,7 +101,10 @@ public:
 
    protected:
 
-   IndexType rows, columns, numberOfColors;
+   IndexType rows, columns;
+
+   // TODO: remove1
+   IndexType numberOfColors;
 
    ValuesVectorType values;
 };