diff --git a/dumux/boxmodels/1p2c/1p2cmodel.hh b/dumux/boxmodels/1p2c/1p2cmodel.hh
index e2701425af9df349f4acb8110ae015a0ef131ece..7a2f19f7a234a03fe4ca76d84c829481cfd62499 100644
--- a/dumux/boxmodels/1p2c/1p2cmodel.hh
+++ b/dumux/boxmodels/1p2c/1p2cmodel.hh
@@ -105,6 +105,10 @@ public:
      * \brief Append all quantities of interest which can be derived
      *        from the solution of the current time step to the VTK
      *        writer.
+     *
+     *        \param sol A vector containing the solutions of the primary variables after solving
+     *        the system of equations
+     *        \param writer
      */
     template<class MultiWriter>
     void addOutputVtkFields(const SolutionVector &sol,