diff --git a/_Sidebar.md b/_Sidebar.md
index 3518518..0f7628e 100644
--- a/_Sidebar.md
+++ b/_Sidebar.md
@@ -1,4 +1,5 @@
 * [Home](Home)
+  * [5.x to 6.x migration note](migrate_5to6)
   * v2.0.x or later
     * [msgpack-c (C++)](v2_0_cpp_overview)
       * [install boost](install_boost) since 4.0