diff --git a/module1/ressources/sequence4.org b/module1/ressources/sequence4.org
index d1fb7d894203a94440f148e108beb77a82a4ec72..b82266f51475c061337af192a8c4537b7f9846ce 100644
--- a/module1/ressources/sequence4.org
+++ b/module1/ressources/sequence4.org
@@ -13,8 +13,8 @@
 #+STARTUP: indent
 
 * Table of contents :TOC:
-- [[Version control with GitLab and Git]]
-- [[Version control with LibreOffice or DokuWiki]]
+- [[#version-control-with-gitlab-and-git-in-the-Reproducible-research-mooc][Version control with GitLab and Git]]
+- [[#version-control-with-libreoffice-or-dokuwiki][Version control with LibreOffice or DokuWiki]]
 
 * Version control with GitLab and Git in the "Reproducible research" MOOC
 We have created a GitLab server especially for this MOOC so that you can smoothly learn how to implement version control.