diff --git a/README.md b/README.md
index 55495c2..9179c19 100644
--- a/README.md
+++ b/README.md
@@ -841,10 +841,10 @@ a minor only adds, and a major is the only release that changes what exists.
 | Library | change or remove an exported name; raise the lowest supported Go | an exported name, a `With…` option |
 
 A patch changes no row of this table: performance, docs, or a fix inside a promised
-behaviour that changes no value, path, format or spelling.
+behaviour that adds or removes no value and changes no path, format or spelling.
 
-Any release may shift a seeded stream, since a value added to a list moves every
-draw after it, so pin fixtures per version. An error's wording may
+Any release, a patch too, may change what a seed draws, so pin seeded fixtures to one
+version. An error's wording may
 improve in a minor; the path, rejected spelling and replacement it names may not.
 
 Before `v1.0.0` a minor is the breaking unit: `0.(x+1).0` may carry a major's