diff --git a/TODO.md b/TODO.md
index e49699e..32e994b 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,7 +1,6 @@
 TODO:
 
-- Clean up BO states
-    - unify `BOEngine.__init__()`
+- unify `BOEngine.__init__()`
 - BO train_x/y transfer between engines for single job
 - multi-GPU dispatcher
 - template job sequences / yamls
@@ -11,3 +10,5 @@ TODO:
 - fold_slice: load diffractions / hdf5 files; change only param per job
     - restructure `FoldSlicePtychoEngine.__init__()` to load data but not params
         - write new `prepare_data.m`
+- separate `config` into `bo_config` and `ptycho_config`; let `BOEngine` have no knowledge of ptychography and vice versa.
+- add GPU version of ExamplePtychoEngine
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