diff --git a/.env.example b/.env.example
index e2489a7..fc6e7b3 100644
--- a/.env.example
+++ b/.env.example
@@ -31,3 +31,9 @@ SSR_CACHE_SECS=3600
 # Processed variants (?w=, ?format=, etc.) are cached for 24 hours.
 # To invalidate a cached raw upload, change its file path.
 # To refresh a processed variant, change its processing parameters.
+
+# Image disk cache limits
+# Max total size in MB (default: 1024)
+IMAGE_DISK_CACHE_MAX_MB=1024
+# Max file age in hours before forced deletion (default: 168)
+IMAGE_DISK_CACHE_MAX_AGE_HOURS=168