diff --git a/questions.md b/questions.md
index a3737a3..a441795 100644
--- a/questions.md
+++ b/questions.md
@@ -29,3 +29,11 @@ not. There's only one (?) at the moment, the `%i"f"` in `Float`;
 should it be changed to case-sensitive?
 
 Q. Should `IOList`s be wrapped in an identifying unary record constructor?
+
+Q. Whitespace - is having `,` as whitespace sensible or not? I can
+think of arguments both ways. Similarly, JSON *benefits* from
+requiring a comma separating each item in a list; we currently don't
+require any whitespace at all between elements of a list, making it
+ambiguous: does `[123]` denote a single-element or a three-element
+list? Compare JSON where `[1,2,3]` is unambiguously different from
+`[123]`.