diff --git a/docs/MAKING_THEMES.md b/docs/MAKING_THEMES.md
index c0c04fd..e0e7781 100644
--- a/docs/MAKING_THEMES.md
+++ b/docs/MAKING_THEMES.md
@@ -77,4 +77,6 @@ If you are using an svg cursor, the size parameter will be ignored.
 
 Mixing png and svg cursor images in one shape will result in an error.
 
+All cursors are required to have an aspect ratio of 1:1.
+
 Please note animated svgs are not supported, you need to add a separate svg for every frame.
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