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-rw-r--r--docs/utilities/spacing.md2
1 files changed, 1 insertions, 1 deletions
diff --git a/docs/utilities/spacing.md b/docs/utilities/spacing.md
index 53a6ab538..91dab4f02 100644
--- a/docs/utilities/spacing.md
+++ b/docs/utilities/spacing.md
@@ -62,7 +62,7 @@ Here are some representative examples of these classes:
{% endhighlight %}
### Horizontal centering
-Additionally, Bootstrap also includes an `.mx-auto` class for horizontally centering fixed-width block level content by setting the horizontal margins to `auto`.
+Additionally, Bootstrap also includes an `.mx-auto` class for horizontally centering fixed-width block level content—that is, content that has `display: block` and a `width` set—by setting the horizontal margins to `auto`.
<div class="bd-example">
<div class="mx-auto" style="width: 200px; background-color: rgba(86,61,124,.15);">