diff --git a/NixOS.md b/NixOS.md
index 615767c..2319a65 100644
--- a/NixOS.md
+++ b/NixOS.md
@@ -19,6 +19,7 @@ This document contains general notes about NixOS that are independent of my NixO
   * [List files of package](#list-files-of-package)
   * [Package runtime dependency report](#package-runtime-dependency-report)
   * [Nix profiles](#nix-profiles)
+    * [Switch to previous system profile](#switch-to-previous-system-profile)
     * [List system profiles](#list-system-profiles)
     * [Garbage collection - Keep most recent X system profiles](#garbage-collection---keep-most-recent-x-system-profiles)
     * [Garbage collection - Delete system profiles older than X days](#garbage-collection---delete-system-profiles-older-than-x-days)