@@ -62,10 +62,13 @@
          (poly-branch-kwargs-tag (id symbol?))
          (-> txexpr?)]
 
 Works just like @racket[poly-branch-tag], but uses Pollen’s @racket[define-tag-function] so that
 keyword arguments will automatically be parsed as X-expression attributes.
+
+Additionally, the branch functions called from the new function must accept exactly two arguments:
+a list of attributes and a list of elements.
 
 @margin-note{The thought behind having two macros so similar is that, by cutting out handling for keyword
 arguments, @racket[poly-branch-tag] could produce simpler and faster code. I have not verified if
 this intuition is meaningful or correct.}