diff --git a/README.md b/README.md
index 9a161f0..ded8ca9 100644
--- a/README.md
+++ b/README.md
@@ -11,3 +11,4 @@ Your exported files should be in a folder near to your Krita project file.
 > [!WARNING] 
 > - You should export from a saved Krita project. An unsaved project will export the files into your home directory (within a folder named `exported_layers` or whatever you set the `export_directory` to in the script.). 
 > - This has only been tested to work on Linux and Windows 11.
+> - You **MUST** have a background layer (a blank one) because background layers are ignored. 
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