diff --git a/windows/deployment/TOC.yml b/windows/deployment/TOC.yml
index 01c507abde..2e06134d85 100644
--- a/windows/deployment/TOC.yml
+++ b/windows/deployment/TOC.yml
@@ -45,6 +45,7 @@
           href: update/plan-define-strategy.md
         - name: Delivery Optimization for Windows 10 updates
           href: update/waas-delivery-optimization.md
+          items:
             - name: Using a proxy with Delivery Optimization
               href: update/delivery-optimization-proxy.md
         - name: Best practices for feature updates on mission-critical devices