mention the custom css

README.md

@@ -45,7 +45,8 @@ its `::before` pseudo-element. This behavior is similar to fonts generated by fo
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 Note that the icon does not include any spacing by default. If you want it, add it in your custom CSS, or include spaces
-in your HTML (perhaps using ` `).
+in your HTML (perhaps using ` `). You can also customize the CSS template in `patcher/css-template.css`;
+this is used as a header, followed by the icon codes.
 
 Another way to add the icon to an element is by adding `data-icon="Ӓ"` where `Ӓ` is a character entity
 code you copied from the preview HTML. This is a bit harder to use, but may be useful in some situations. You can also