diff --git a/doc/todo/support_multi-row_table_headers.mdwn b/doc/todo/support_multi-row_table_headers.mdwn
index 1d418a41b..07198fd5c 100644
--- a/doc/todo/support_multi-row_table_headers.mdwn
+++ b/doc/todo/support_multi-row_table_headers.mdwn
@@ -96,3 +96,33 @@ and easily underneath.
 
 I'd appreciate your take on the above suggestions [[smcv]] before I roll my sleeves up.
 Thanks! — [[Jon]] (2018-09-24)
+
+> I continue to think that the `header` parameter shouldn't be sometimes a
+> description of which parts of the table are header, and sometimes the header
+> data itself; so if you want an inline header, it should indeed have a
+> distinct name.
+>
+> If you can think of a good name for the new parameter, and can document it
+> reasonably clearly, then I would be OK with having a separate parameter that
+> is the externally-provided header. I don't know what the right name for that
+> parameter would be: `headercontent` or `headerblock` is unwieldy but I can't
+> think of anything better.
+>
+> It would maybe simplify things to make it mutually exclusive with `header`,
+> but then you wouldn't be able to express things like "the first column of my
+> CSV is a header, the first row is just an ordinary row, and please add
+> this literal header row to the top".
+>
+> It might help to write the documentation and/or tests first, and then
+> implement it afterwards, when you have an "API" you're happy with.
+>
+> Corner cases:
+>
+> How would it work if you want to add a literal header column on the left
+> rather than adding a literal header row on the top? If you add both, what
+> happens at the top left corner?
+>
+> Is it necessary to be able to add header columns on the right (for RTL
+> languages?), or header rows (footer rows, I suppose) on the bottom?
+>
+> --[[smcv]]