diff --git a/arraycontext/impl/pytato.py b/arraycontext/impl/pytato.py
index e6d79704cea80ccdc29896b19a19646c60231c3b..5ecf9cfda4b01a4b091966fab561d2c40056cd14 100644
--- a/arraycontext/impl/pytato.py
+++ b/arraycontext/impl/pytato.py
@@ -142,6 +142,7 @@ class _PytatoFakeNumpyNamespace(BaseFakeNumpyNamespace):
         return obj_or_dof_array_vectorize_n_args(pt.minimum, x, y)
 
     def where(self, criterion, then, else_):
+        # FIXME: where() does not work
         import pytato as pt
         from meshmode.dof_array import obj_or_dof_array_vectorize_n_args
         return obj_or_dof_array_vectorize_n_args(pt.where, criterion, then, else_)