diff --git a/packages/cache/README.md b/packages/cache/README.md
index d640238b3..1429cc68b 100644
--- a/packages/cache/README.md
+++ b/packages/cache/README.md
@@ -53,7 +53,7 @@ The prefix before class names. It will also be set as the value of the `data-emo
 
 `HTMLElement`
 
-A DOM node that emotion will insert all of its style tags into. This is useful for inserting styles into iframes.
+A DOM node that emotion will insert all of its style tags into. This is useful for inserting styles into iframes or windows.
 
 ### `prepend`