diff --git a/ICON.md b/BRANDING.md
similarity index 85%
rename from ICON.md
rename to BRANDING.md
index 0887fbe..4c77564 100644
--- a/ICON.md
+++ b/BRANDING.md
@@ -1,5 +1,8 @@
 # GridPool triangle icon
 
+Keep this guide named BRANDING.md: StartOS icon discovery treats ICON.md as a
+second candidate beside icon.svg regardless of its extension.
+
 The production master is `icon.svg`, shared byte-for-byte with the Umbrel
 package's `gridlabs-gridpool/icon.svg`. No fonts, scripts, or external assets.