Update README.md

README.md

@@ -31,9 +31,7 @@ Credit : https://civitai.com/models/896697
 
 You should use `then-and-now` to trigger the image generation.
 
-You should use `The foreground image is X` to trigger the image generation.
-
-You should use `The background image is Y` to trigger the image generation.
+You should use `The foreground image is X, The background image is Y`
 
 
 ## Download model