State the alternatives rule by the row a cell sits in

README.md

@@ -550,9 +550,9 @@ any template, a `repeat` or a `drawGroup` included, since a bare read of the ref
 table draws its row without pinning it, so the family would draw apart from that row:
 read the family from a template beside it, or add the value as a column. A cell's
 reads are the render's too, weighed against every read that renders with them. A
-reference renders one row of a table, so reads under different selected rows of it, or
-of their ancestors, never render together, and nor do reads under different rows of one
-reference that selects none.
+reference renders one row of a table, so reads in cells of different rows of it, or of
+different rows of their ancestors, never render together, whether `[key]` selects the row
+or the reference draws it.
 
 ### Options and fields