diff --git a/windows/security/threat-protection/TOC.md b/windows/security/threat-protection/TOC.md
index 1a28e90b3d..3d007b0d50 100644
--- a/windows/security/threat-protection/TOC.md
+++ b/windows/security/threat-protection/TOC.md
@@ -122,6 +122,7 @@
 
 ### [Configure and manage capabilities](windows-defender-atp/onboard.md)
 #### [Configure attack surface reduction](windows-defender-atp/configure-attack-surface-reduction.md)
+####Hardware-based isolation
 ##### [System isolation](windows-defender-system-guard/system-guard-secure-launch-and-smm-protection.md)
 ##### [Application isolation](windows-defender-application-guard/install-wd-app-guard.md)
 ###### [Configuration settings](windows-defender-application-guard/configure-wd-app-guard.md) 
diff --git a/windows/security/threat-protection/windows-defender-atp/TOC.md b/windows/security/threat-protection/windows-defender-atp/TOC.md
index f55fffc008..e6781a6ef3 100644
--- a/windows/security/threat-protection/windows-defender-atp/TOC.md
+++ b/windows/security/threat-protection/windows-defender-atp/TOC.md
@@ -119,6 +119,7 @@
 
 ## [Configure and manage capabilities](onboard.md)
 ### [Configure attack surface reduction](configure-attack-surface-reduction.md)
+###Hardware-based isolation
 #### [System isolation](../windows-defender-system-guard/system-guard-secure-launch-and-smm-protection.md)
 #### [Application isolation](../windows-defender-application-guard/install-wd-app-guard.md)
 ##### [Configuration settings](../windows-defender-application-guard/configure-wd-app-guard.md)