diff --git a/.env.example b/.env.example
index 729f517..bde007a 100644
--- a/.env.example
+++ b/.env.example
@@ -17,6 +17,7 @@ FILTER_TIMEOUT=120
 FILTER_TIMEOUT_LONG=300
 MAX_FILTER_ATTEMPTS=8
 MAX_EDGE_PX=2000
+PREPROCESS_TIMEOUT=120
 # birefnet-general OOMs on the ~8GB box; u2net + alpha ≈ `rembg i -a`
 REMBG_MODEL=u2net
 REMBG_ALPHA=1