Update form.rst

ThomasLandauer · web-flow · commit 8b02c6b87319 · 2021-04-13T21:27:07.000+02:00
diff --git a/reference/forms/types/form.rst b/reference/forms/types/form.rst
@@ -177,6 +177,8 @@ of the form type tree (i.e. it cannot be used as a form type on its own).
 
 .. include:: /reference/forms/types/options/label.rst.inc
 
+.. _reference-form-option-label-html:
+
 .. include:: /reference/forms/types/options/label_html.rst.inc
 
 .. include:: /reference/forms/types/options/row_attr.rst.inc
