diff --git a/guide/english/css/index.md b/guide/english/css/index.md
index c8fb4a6514..86c939ceea 100644
--- a/guide/english/css/index.md
+++ b/guide/english/css/index.md
@@ -32,4 +32,8 @@ The site [CSS Zen Garden](http://www.csszengarden.com/) is a great example of ho
 
 For a demonstration of the power of CSS, check out [Species In Pieces](http://species-in-pieces.com/#).
 
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+When you're practice and working with CSS, you can refer to this [CSS reference](https://cssreference.io/) to help you along the way if you're unsure about a property. A great tool for helping visualize what each CSS property does.
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 To find some awesome articles and summaries of Front End Development related ideas visit [CSS-Tricks](https://css-tricks.com)
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