diff --git a/README.md b/README.md
index 601d387..f2688bf 100644
--- a/README.md
+++ b/README.md
@@ -62,7 +62,7 @@ COLOUR:
 
 `hover (string)` Name of the colour to use when the icon is hovered over
 
-`classes (string[])` Additional classes to add to the icon. This can cause Tailwind class collisions, so only use it as a last resort.
+`classes (string[]|string)` Additional classes to add to the icon as either an array of strings or a space-separated string. This can cause Tailwind class collisions, so it is not recommended to use.
 
 ## Reminders
 Remember to add `./config/packages/*.yaml` as a value in your Tailwind config content array if it does not already exist. This will ensure Tailwind classes inside of the config file get compiled.