diff --git a/.env.example b/.env.example
index d97cbf5..e2489a7 100644
--- a/.env.example
+++ b/.env.example
@@ -26,7 +26,8 @@ DB_POOL_SIZE=20
 # SSR page cache duration in seconds (default: 3600)
 SSR_CACHE_SECS=3600
 
-# Image serving cache headers
+# Image serving cache headers (hardcoded defaults)
 # Uploaded image assets are served with Cache-Control: public, max-age=31536000, immutable.
 # Processed variants (?w=, ?format=, etc.) are cached for 24 hours.
-# To force browsers to refresh, change the URL or restart the server.
+# To invalidate a cached raw upload, change its file path.
+# To refresh a processed variant, change its processing parameters.