diff --git a/docs/documentation/helpers/flexbox-helpers.html b/docs/documentation/helpers/flexbox-helpers.html
index e20a4d327..6e44dadba 100644
--- a/docs/documentation/helpers/flexbox-helpers.html
+++ b/docs/documentation/helpers/flexbox-helpers.html
@@ -62,7 +62,7 @@
 
 <div class="content">
   <p>
-    All of the <strong>Flexbox CSS properties</strong> are available as Bulma helpers:
+    Combined with <code>is-flex</code>, all of the <strong>Flexbox CSS properties</strong> are available as Bulma helpers:
   </p>
   <ul>
     <li><code>flex-direction</code></li>