diff --git a/dune/gfe/localenergy.hh b/dune/gfe/localenergy.hh
index ba6f8da46fcd2db1323418662ecf1b74dc2ff867..e7e2f3efd1e49801bb53206fcb0a7a05222dcb07 100644
--- a/dune/gfe/localenergy.hh
+++ b/dune/gfe/localenergy.hh
@@ -3,9 +3,7 @@
 
 #include <vector>
 
-namespace Dune {
-
-namespace GFE {
+namespace Dune::GFE {
 
 /** \brief Base class for energies defined by integrating over one grid element */
 template<class Basis, class TargetSpace>
@@ -16,11 +14,9 @@ public:
   /** \brief Compute the energy
    *
    * \param localView Local view specifying the current element and the FE space there
-   * \param coefficients The coefficients of a FE function on the current element
+   * \param localSolution The coefficients of a FE function on the current element
    */
-  virtual typename TargetSpace::ctype
-  energy (const typename Basis::LocalView& localView,
-          const std::vector<TargetSpace>& localSolution) const = 0;
+  virtual typename TargetSpace::ctype energy (const typename Basis::LocalView& localView, const std::vector<TargetSpace>& localSolution) const = 0;
 
   /** Empty virtual default destructor
    *
@@ -30,9 +26,8 @@ public:
 
 };
 
-}  // namespace GFE
+}  // namespace Dune::GFE
 
-}  // namespace Dune
 
 #endif  // DUNE_GFE_LOCALENERGY_HH