diff --git a/src/solvers/dgsem_p4est/dg_2d_parabolic.jl b/src/solvers/dgsem_p4est/dg_2d_parabolic.jl
index 51d3653ec2..a04523d2fb 100644
--- a/src/solvers/dgsem_p4est/dg_2d_parabolic.jl
+++ b/src/solvers/dgsem_p4est/dg_2d_parabolic.jl
@@ -22,6 +22,8 @@ function create_cache_parabolic(mesh::P4estMesh{2}, equations_hyperbolic::Abstra
     return cache
 end
 
+# TODO: Remove in favor of the implementation for the TreeMesh 
+#       once the P4estMesh can handle mortars as well
 function rhs_parabolic!(du, u, t, mesh::P4estMesh{2},
                         equations_parabolic::AbstractEquationsParabolic,
                         initial_condition, boundary_conditions_parabolic, source_terms,