diff --git a/windows/deployment/TOC.yml b/windows/deployment/TOC.yml
index d652da0a0a..cff68ffb1d 100644
--- a/windows/deployment/TOC.yml
+++ b/windows/deployment/TOC.yml
@@ -166,6 +166,7 @@
               href: update/waas-configure-wufb.md
             - name: Windows Update for Business deployment service
               href: update/deployment-service-overview.md
+              items:
                 - name: Troubleshooting the Windows Update for Business deployment service
                   href: update/deployment-service-troubleshooting.md
             - name: Enforcing compliance deadlines for updates