diff --git a/aio/content/guide/lifecycle-hooks.md b/aio/content/guide/lifecycle-hooks.md
index 46d06fbb98..27396d9e16 100644
--- a/aio/content/guide/lifecycle-hooks.md
+++ b/aio/content/guide/lifecycle-hooks.md
@@ -569,7 +569,7 @@ which can only be reached by querying for them via the property decorated with
 
 {@a no-unidirectional-flow-worries}
 
-<div class="alert is-helpful>
+<div class="alert is-helpful">
 
 <header>No need to wait for content updates</header>