-@item @code{stretchability} -- a unitless measure of the
-dimension's relative propensity to stretch. If zero, the distance
-will not stretch (unless collisions would result).
+
+@item
+@code{padding} -- the minimum required amount of unobstructed
+vertical whitespace between the two items, measured in
+staff-spaces.
+
+@item
+@code{stretchability} -- a unitless measure of the dimension's
+relative propensity to stretch. If zero, the distance will not
+stretch (unless collisions would result).
+