Card Columns docs: Link to MDN multi-column CSS docs

diff --git a/docs/components/card.md b/docs/components/card.md
index 168b189df2fcd7d9a00466ab24706d0280d5aca5..6ab983cbd01abc93078442e9197d7f2c69c3eed7 100644 (file)
--- a/docs/components/card.md
+++ b/docs/components/card.md
@@ -365,7 +365,7 @@ Need a set of equal width and height cards that aren't attached to one another?
 
 Cards can be organized into [Masonry](http://masonry.desandro.com)-like columns with just CSS by wrapping them in `.card-columns`.
 
-**Heads up!** This is **not available in IE9 and below** as they have no support for the `column` CSS properties.
+**Heads up!** This is **not available in IE9 and below** as they have no support for the [`column-*` CSS properties](https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Using_multi-column_layouts).
 
 {% example html %}
 <div class="card-columns">