diff --git a/TODO b/TODO
index b65ef4f2ff725540c87bfc9d0d5b6e4a943b4796..5395c3f58f15b8c2cfec49438489941b5405dcc0 100644
--- a/TODO
+++ b/TODO
@@ -2,4 +2,7 @@
 - Allow host grids with more than one element type
 - At least in 2.0, the leaf element iterator crashes if the subgrid is empty
 - Implement SubGridSeed properly
+- method Dune::GeometryType::basicType() was removed in Dune 2.3svn but is used in subgrid:
+  dune-subgrid/dune/subgrid/subgrid/subgridindexstorage.hh:217:36: error: 'const class Dune::GeometryType' has no member named 'basicType'
+  Find a replacement!