diff --git a/grudge/symbolic/mappers/__init__.py b/grudge/symbolic/mappers/__init__.py
index ebc771f9a82424b8711cd69741f1c265fea84f50..a6914e1fd56af9cb43210177a05e2006aed45d34 100644
--- a/grudge/symbolic/mappers/__init__.py
+++ b/grudge/symbolic/mappers/__init__.py
@@ -643,7 +643,6 @@ class GlobalToReferenceMapper(CSECachingMapperMixin, IdentityMapper):
 
         elif isinstance(expr.op, op.InverseMassOperator):
             if self.use_wadg:
-                # TODO: this is also required for flat curvilinear elements
                 # based on https://arxiv.org/pdf/1608.03836.pdf
                 return op.RefInverseMassOperator(dd_in, dd_out)(
                     op.RefMassOperator(dd_in, dd_out)(