diff --git a/opm/core/pressure/IncompTpfa.hpp b/opm/core/pressure/IncompTpfa.hpp
index 23105ce15..358a1cff1 100644
--- a/opm/core/pressure/IncompTpfa.hpp
+++ b/opm/core/pressure/IncompTpfa.hpp
@@ -61,10 +61,10 @@ namespace Opm
 
 	/// Assemble and solve incompressible pressure system.
 	/// \param[in]  totmob     Must contain N total mobility values (one per cell).
-	///                        totmob = \sum_{p} kr_p/mu_p.
+	///                        \f$totmob = \sum_{p} kr_p/mu_p\f$.
 	/// \param[in]  omega      Must be empty if constructor gravity argument was null.
 	///                        Otherwise must contain N mobility-weighted density values (one per cell).
-	///                        omega = \frac{\sum_{p} mob_p rho_p}{\sum_p rho_p}.
+	///                        \f$omega = \frac{\sum_{p} mob_p rho_p}{\sum_p rho_p}\f$.
 	/// \param[in]  src        Must contain N source rates (one per cell).
 	///                        Positive values represent total inflow rates,
 	///                        negative values represent total outflow rates.