diff --git a/doc/NAC/PnacSonicHLD.md b/doc/NAC/PnacSonicHLD.md
index e1f427e8a9..51c78cb776 100644
--- a/doc/NAC/PnacSonicHLD.md
+++ b/doc/NAC/PnacSonicHLD.md
@@ -5,19 +5,19 @@
 
 # Table of Contents
 * [Revision](#revision)
-* [About this Document](#about-this-Document)
+* [About this Document](#About-this-Document)
 * [Scope](#scope)
-* [Definitions/Abbreviations](#definitionsabbreviations)
-* [1 Requirements Overview](#1-requirements-overview)
-   * [1.1 Functional Requirements](#11-functional-requirements)
+* [Definitions/Abbreviations](#DefinitionsAbbreviations)
+* [1 Requirements Overview](#1-Requirements-Overview)
+   * [1.1 Functional Requirements](#11-Functional-Requirements)
    * [1.2 Performance Requirements](#12-Performance-Requirements)
-   * [1.3 Configuration and Management Requirement](#13-configuration-and-management-requirements)
-* [2 Functionality](#2-functionality)
-   * [2.1 Target Deployment Use Cases](#21-target-deployment-use-cases)
-   * [2.2 Functional Description](#22-functional-description)
- * [3 Design](#3-design)
+   * [1.3 Configuration and Management Requirement](#13-Configuration-and-Management-Requirements)
+* [2 Functionality](#2-Functionality)
+   * [2.1 Target Deployment Use Cases](#21-Target-Deployment-Use-Cases)
+   * [2.2 Functional Description](#22-Functional-Description)
+ * [3 Design](#3-Design)
     * [3.1 Options to Block or allows port traffic based on Authentication status of the port](#31-Options-to-Block-or-allows-port-traffic-based-on-Authentication-status-of-the-port)
-      * [3.1.1 Options-1 Allowing or Blocking user traffic by using RSTP/STP states](#311-Options-1-Allowing-or-Blocking-user-traffic-by-using-RSTP-STP-states)
+      * [3.1.1 Options-1 Allowing or Blocking user traffic by using RSTP STP states](#311-Options-1-Allowing-or-Blocking-user-traffic-by-using-RSTP-STP-states)
       * [3.1.2 Option-2 Allowing or Blocking user traffic by configuring L2-ACL filters](#312-Option-2-Allowing-or-Blocking-user-traffic-by-configuring-L2-ACL-filters)
       * [3.1.3 Option-3 Allowing or Blocking user traffic by configuring ***learn_mode***](#313-Option-3-Allowing-or-Blocking-user-traffic-by-configuring-***learn-mode***)
     * [3.2 PNAC software architecture](#32-PNAC-software-architecture)