diff --git a/_Sidebar.md b/_Sidebar.md
index 695f731..bb5d7d9 100644
--- a/_Sidebar.md
+++ b/_Sidebar.md
@@ -1,6 +1,5 @@
 * [Introduction](Introduction)
 * [History](History)
 * [Goals](Goals)
-* [Hierarchical organization](Hierarchical-organization)
 * [Technical specifications](Technical-specifications) / [Especificaciones técnicas](Technical-specifications.es)
 * [**User guide**](User-guide) / [**Guía del usuario**](User-guide.es)
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