diff --git a/_Sidebar.md b/_Sidebar.md
index aaeb82e..9c4a757 100644
--- a/_Sidebar.md
+++ b/_Sidebar.md
@@ -159,6 +159,7 @@
   * [Access Radio Hardware](Access-Radio-Hardware)
   * [Interpret Guru meditation crashes](Interpret-Guru-meditation-crashes)
   * Create a Complex App
+  * [Theme-system](Theme-system)
   * [Debug via SWD & JTAG](Debug-via-SWD-&-JTAG)
   * [Debug with serial](Debug-with-serial)
 * Tools