README update.

README.md

@@ -515,7 +515,7 @@ The tool also supports the expert settings. Do not use them until you read the d
 
 - Show schemas - you'll be able to edit or define your own texture or tree schemas. It's useful if you want to add some custom textures or trees to the map. Refer to the [Texture schema](#texture-schema) section to learn more about the schema structure. Any incorrect value here will lead to the completely broken map.
 
-- Upload custom background image - if you have an image, which represents the map and background terrain you can use it for generation. Note, that the image should meet the following requirements: 1:1 aspect ratio, size = map size + 2048 * 2, it should be uint16 (unsigned 16-bit integer) grayscale (single channel) image. The image should be in the PNG format. If any of the requirements are not met, the tool raises an error.
+- Upload custom background image - if you have an image, which represents the map and background terrain you can use it for generation. Note, that the image should meet the following requirements: 1:1 aspect ratio, size = map size + 2048 * 2, it should be uint16 (unsigned 16-bit integer) grayscale (single channel) image. The image should be in the PNG format. If any of the requirements are not met, the tool raises an error. If you're using rotation, the image should already be rotated.
 
 ## Resources
 In this section, you'll find a list of the resources that you need to create a map for the Farming Simulator.<br>