message: added more notes
diff: @@ -626,7 +626,7 @@ void AmgXSolver::SetMatrix(const HypreParMatrix &A, const bool update_mat)
  }
  // Set A_ptr to NULL
  - // Free A_csr hypre_MergeDiagAndOffd
  + // Free A_csr data from hypre_MergeDiagAndOffd method
  A_ptr = NULL;
  hypre_CSRMatrixDestroy(A_csr);
  