diff --git a/docs/themes/opacity/index.html b/docs/themes/opacity/index.html
index e66403e49..f8aace082 100644
--- a/docs/themes/opacity/index.html
+++ b/docs/themes/opacity/index.html
@@ -73,7 +73,7 @@ <h3 class="f6 ttu tracked mt0">Opacity</h3>
       </article>
       <div class="ph3 ph5-ns pt4 pb5">
         <h3 class="f5 mb4 pb2 bb">Examples</h3>
-        <h4 class="f6 mt4">Opacity scale</h3>
+        <h4 class="f6 mt4">Opacity scale</h4>
         <code class="f6 db mv3"></code>
         <section class="cf">
           <div class="fl w-100 w-33-l pt4">