From 2d45e0991b4a4cf2f5d4650c40374af3d6b21f3a Mon Sep 17 00:00:00 2001
From: xfy <i@rua.plus>
Date: Wed, 17 Jun 2026 14:22:20 +0800
Subject: [PATCH] docs: clarify image cache invalidation behavior

---
 .env.example | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

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.