diff --git a/.gitea/workflows/checks.yml b/.gitea/workflows/checks.yml
index a7c3155..44709c0 100644
--- a/.gitea/workflows/checks.yml
+++ b/.gitea/workflows/checks.yml
@@ -116,8 +116,15 @@ name: checks
 # the guard lives inside the workflow that a filter makes Gitea skip. Blind
 # spot 3 is the one that matters: a filter naming a branch THIS pull request
 # does not target is itself skipped, lands green and untested, and then every
-# subsequent pull request matching it is skipped too. That is the gate off,
-# silently.
+# subsequent pull request the filter DOES NOT NAME is skipped too. That is the
+# gate off, silently.
+#
+# ⚠️ THAT DIRECTION IS THE WHOLE POINT AND IT IS EASY TO WRITE BACKWARDS. A
+# pull request that MATCHES the filter still runs; it is the one the filter
+# excludes that Gitea sits out, reports `skipped`, and the rollup launders
+# into `success`. An earlier draft of this very clause said "matching it is
+# skipped", which is the inverse of the measurement and contradicted the
+# paragraph directly below.
 #
 # ⚠️ AND THE DANGEROUS ONE IS NOT `branches: [main]`, WHICH AT LEAST LOOKS
 # WRONG. It is `branches: [release/1.0]`, which looks like tightening onto the