diff --git a/README.md b/README.md
index 466f78c..65e1d05 100644
--- a/README.md
+++ b/README.md
@@ -17,4 +17,6 @@ helm upgrade --install mktxp brunner.ninja/mktxp \
   --namespace default --create-namespace --wait --timeout 5m
 ```
 
-Chart tags version this adapter; `appVersion` selects the upstream image.
+Tag this adapter from the upstream image release: `v2.1.0` publishes chart
+`2.1.0`. Later chart commits append the Git describe count and hash;
+`appVersion` remains the upstream image version.