diff --git a/zip-0316.rst b/zip-0316.rst
index a73d519f..a836ffa9 100644
--- a/zip-0316.rst
+++ b/zip-0316.rst
@@ -718,7 +718,9 @@ Since this streaming implementation of :math:`\mathsf{F4Jumble}^{-1}` is
 quite complicated, we do not require all Consumers to support it. If a
 Consumer implementation cannot support UAs / UVKs up to the maximum length,
 it MUST nevertheless support UAs / UVKs with :math:`\ell_M` of at least
-:math:`256` bytes.
+:math:`256` bytes. Note that this effectively defines two conformance levels
+to this specification. A full implementation will support UAs / UVKs up to
+the maximum length.
 
 
 Dependencies