diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -251,5 +251,16 @@ action:
 - Assist replies use the standard conversation pipeline, so whichever agent you
   select (built-in intents, a local LLM, a cloud LLM, …) is what answers.
 
+## Brand icon
+
+`custom_components/reticulum/brand/icon.png` (256x256) and `icon@2x.png`
+(512x512) are the integration's own icon. Since HA 2026.x the `brands`
+component serves `/api/brands/integration/reticulum/<image>` from a custom
+integration's `brand/` directory before falling back to the brands CDN, so
+without them the integration shows the grey placeholder. Detection is
+`Integration.has_branding`, which only checks that a top-level `brand`
+directory exists - it is a cached property, so Home Assistant has to be
+restarted after the files land.
+
 ## License
 MIT
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