diff --git a/python/aghast/connect/root.py b/python/aghast/connect/root.py
index cf08c87..e06bc38 100644
--- a/python/aghast/connect/root.py
+++ b/python/aghast/connect/root.py
@@ -272,6 +272,7 @@ def toroot(obj, name):
             return out
 
         elif len(axissummary) == 2:
+            # start here for Aghast -> ROOT conversion; probably after you've already made some ghastly histograms from ROOT
             raise NotImplementedError
 
         elif len(axissummary) == 3:
@@ -363,6 +364,7 @@ def fromroot(obj, collection=False):
                 return out
 
         elif isinstance(obj, ROOT.TH2):
+            # start here for ROOT -> Aghast; this should probably be the direction you do first, to have something to work with
             raise NotImplementedError
 
         elif isinstance(obj, ROOT.TH3):
diff --git a/python/tests/test_root.py b/python/tests/test_root.py
index 1a21c5b..f7103ac 100644
--- a/python/tests/test_root.py
+++ b/python/tests/test_root.py
@@ -110,3 +110,8 @@ def test_root_oned(cls):
     for x in data: before.Fill(x)
     after = connect_root.toroot(connect_root.fromroot(before), rootname())
     check1d(before, after)
+
+@pytest.mark.parametrize("cls", [TH2D])   # [ROOT.TH2C, ROOT.TH2S, ROOT.TH2I, ROOT.TH2F, ROOT.TH2D])
+def test_root_twod(cls):
+    before = cls(rootname(), "title", 5, -2.0, 2.0, 6, -3.0, 3.0)
+    # test driven development: make examples here of what you want to convert and then fill in the code that does it