Clarify card group behavior (#30416)

Co-authored-by: Mark Otto <markd.otto@gmail.com>
twbs · Mar 18, 2020 · 41d8856 · 41d8856
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commit 41d8856
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/site/docs/4.4/components/card.md b/site/docs/4.4/components/card.md
@@ -479,7 +479,7 @@ In addition to styling the content within cards, Bootstrap includes a few option
 
 ### Card groups
 
-Use card groups to render cards as a single, attached element with equal width and height columns. Card groups use `display: flex;` to achieve their uniform sizing.
+Use card groups to render cards as a single, attached element with equal width and height columns. Card groups start off stacked and use `display: flex;` to become attached with uniform dimensions starting at the `sm` breakpoint.
 
 {% capture example %}
 <div class="card-group">