diff --git a/README.md b/README.md
index 3b161a9..e963268 100644
--- a/README.md
+++ b/README.md
@@ -126,7 +126,8 @@ DEMO_PORT=15432 \
 python app/app_sana.py \
     --share \
     --config=configs/sana_config/1024ms/Sana_1600M_img1024.yaml \
-    --model_path=hf://Efficient-Large-Model/Sana_1600M_1024px/checkpoints/Sana_1600M_1024px.pth
+    --model_path=hf://Efficient-Large-Model/Sana_1600M_1024px/checkpoints/Sana_1600M_1024px.pth \
+    --image_size=1024
 ```
 
 ### 1. How to use `SanaPipeline` with `🧨diffusers`