diff --git a/dumux/flux/staggered/freeflow/fickslaw.hh b/dumux/flux/staggered/freeflow/fickslaw.hh
index 8fc67054afa3a7a9601f0e37f58211b5acc2f93e..a1a36d25ae7f758df2bb91ef11acb0dac4452af9 100644
--- a/dumux/flux/staggered/freeflow/fickslaw.hh
+++ b/dumux/flux/staggered/freeflow/fickslaw.hh
@@ -84,6 +84,12 @@ public:
 
     using DiffusionCoefficientsContainer = FickianDiffusionCoefficients<Scalar, numPhases, numComponents>;
 
+    /*!
+     * \brief Returns the diffusive fluxes of all components within
+     *        a fluid phase across the given sub-control volume face.
+     *        The computed fluxes are given in mole/s or kg/s, depending
+     *        on the template parameter ReferenceSystemFormulation.
+     */
     template<class Problem, class ElementVolumeVariables>
     static NumEqVector flux(const Problem& problem,
                             const Element& element,
diff --git a/dumux/flux/staggered/freeflow/fourierslaw.hh b/dumux/flux/staggered/freeflow/fourierslaw.hh
index 47658aaac163328eaeb25f51f320b62ee6bcb900..578777bda0751d287e8e7693171b308bd524eb9b 100644
--- a/dumux/flux/staggered/freeflow/fourierslaw.hh
+++ b/dumux/flux/staggered/freeflow/fourierslaw.hh
@@ -61,7 +61,13 @@ public:
     //! We don't cache anything for this law
     using Cache = FluxVariablesCaching::EmptyDiffusionCache;
 
-    //! calculate the diffusive energy fluxes
+    /*!
+     * \brief Returns the heat flux within the porous medium
+     *        (in J/s) across the given sub-control volume face.
+     * \note This law assumes thermal equilibrium between the fluid
+     *       and solid phases, and uses an effective thermal conductivity
+     *       for the overall aggregate.
+     */
     template<class Problem>
     static Scalar flux(const Problem& problem,
                        const Element& element,
diff --git a/dumux/flux/staggered/freeflow/maxwellstefanslaw.hh b/dumux/flux/staggered/freeflow/maxwellstefanslaw.hh
index 2abb7a4bbbe2b9499947dedada062e332ab3d5cf..d74deb75234d4300dc7b79fc1e8f618704710d7a 100644
--- a/dumux/flux/staggered/freeflow/maxwellstefanslaw.hh
+++ b/dumux/flux/staggered/freeflow/maxwellstefanslaw.hh
@@ -88,6 +88,11 @@ public:
 
     using DiffusionCoefficientsContainer = MaxwellStefanDiffusionCoefficients<Scalar, numPhases, numComponents>;
 
+    /*!
+     * \brief Returns the diffusive fluxes of all components within
+     *        a fluid phase across the given sub-control volume face.
+     *        The computed fluxes are given in kg/s.
+     */
     template<class ElementVolumeVariables>
     static CellCenterPrimaryVariables flux(const Problem& problem,
                                            const Element& element,