diff --git a/developer/topics/forms_api_reference.html b/developer/topics/forms_api_reference.html
index 723a79c..7f9e68e 100644
--- a/developer/topics/forms_api_reference.html
+++ b/developer/topics/forms_api_reference.html
@@ -2661,7 +2661,7 @@ does not conflict with any other internal property of the Form API.</p>
 <h3><a name="vertical_tabs" id="vertical_tabs">vertical_tabs</a></h3>
 
 <p><strong>Description</strong>:
-Format all child fieldsets and details and all non-child fieldsets and details whose <a href="#group">#group</a> is assigned the element's name as vertical tabs.</p>
+Formats all child fieldsets or details as vertical tabs. Non-child fieldsets or details can be added to the vertical tab by setting their <a href="#group">#group</a> to the vertical tab's element name will be added to .</p>
 
 <p><strong>Properties</strong>:
 <a href="#access">#access</a>, <a href="#after_build">#after_build</a>,