diff --git a/tutorials/tutorial2.cpp b/tutorials/tutorial2.cpp
index 9e84921e6..79efb1b83 100644
--- a/tutorials/tutorial2.cpp
+++ b/tutorials/tutorial2.cpp
@@ -108,12 +108,15 @@ int main()
     Opm::LinearSolverUmfpack linsolver;
     /// \endcode
     /// \page tutorial2
+
     /// We set up a pressure solver for the incompressible problem,
-    /// using the two-point flux approximation discretization.
-    /// The third argument which corresponds to gravity is set to
-    /// zero (no gravity).
+    /// using the two-point flux approximation discretization.  The
+    /// third argument which corresponds to gravity is set to a null
+    /// pointer (no gravity). The final argument would be a pointer to
+    /// a Wells data structure, again we use a null pointer to
+    /// indicate that we have no wells.
     /// \code
-    Opm::IncompTpfa psolver(*grid.c_grid(), &permeability[0], 0, linsolver);
+    Opm::IncompTpfa psolver(*grid.c_grid(), &permeability[0], 0, linsolver, 0);
     /// \endcode
     /// \page tutorial2
     /// We define the source term.
diff --git a/tutorials/tutorial3.cpp b/tutorials/tutorial3.cpp
index fc15ab30d..f3a2e77c4 100644
--- a/tutorials/tutorial3.cpp
+++ b/tutorials/tutorial3.cpp
@@ -164,10 +164,11 @@ int main ()
     /// \page tutorial3
     /// \details We may now set up the pressure solver. At this point,
     /// unchanging parameters such as transmissibility are computed
-    /// and stored internally by the IncompTpfa class.
+    /// and stored internally by the IncompTpfa class. The final (null pointer)
+    /// constructor argument is for wells, which are now used in this tutorial.
     /// \code
     LinearSolverUmfpack linsolver;
-    IncompTpfa psolver(grid, props.permeability(), grav, linsolver);
+    IncompTpfa psolver(grid, props.permeability(), grav, linsolver, 0);
     /// \endcode
 
     /// \page tutorial3