diff --git a/README.md b/README.md
index d5c7eac..c0ac696 100644
--- a/README.md
+++ b/README.md
@@ -9,8 +9,13 @@ registry/Matrix endpoints, and storage settings in
 
 The chart uses upstream `crazymax/diun` release tags. Its Chart `appVersion`
 is the Diun release; the chart package version is derived from Git tags with
-`git describe`. The Matrix integration downloads Shoutrrr 0.14.0 at startup
-because later 0.14.1 sent duplicate Matrix authentication data rejected by the
+`git describe`. The chart repository's baseline tag is the same release,
+`v4.33.0`, so the next chart-only commit packages as
+`4.33.0-1-g<commit>` rather than an unrelated `1.0.0` version. On a Diun
+upgrade, update `Chart.yaml.appVersion`, verify the default image follows it,
+test the chart, and tag the new upstream version. The Matrix integration
+downloads Shoutrrr 0.14.0 at startup because later 0.14.1 sent duplicate
+Matrix authentication data rejected by the
 configured Synapse. The init image uses a readable curl image tag. No image
 digests or hard-coded download checksums are used.