diff --git a/.hyperhive/review-classifier.yml b/.hyperhive/review-classifier.yml
index 8e75b360..bb5f5fa2 100644
--- a/.hyperhive/review-classifier.yml
+++ b/.hyperhive/review-classifier.yml
@@ -45,7 +45,13 @@ classifications:
     description: >-
       A change to what an operator or user sees, such as a command, flag,
       option, endpoint, service or default, updates the matching page under
-      docs/ or the crate's README in the same diff.
+      docs/ or the crate's README in the same diff. For a nix option whose
+      own default, type or meaning changes, an updated `description` on that
+      option counts as the documentation. It does not cover a change in what
+      a service does for operators across hosts, such as what it scrapes,
+      serves or publishes: that needs a docs/ page or README. A nix option
+      declared `internal = true` or `visible = false` is not something an
+      operator sees, so adding or changing one needs none of these.
     polarity: positive
     threshold: 65
   - name: one-purpose