--- a/vagrant.rst	Wed Dec 19 14:08:52 2018 +0200
+++ b/vagrant.rst	Wed Dec 19 15:54:27 2018 +0200
@@ -180,6 +180,8 @@
 
   vagrant up --debug-timestamp
 
+https://www.vagrantup.com/docs/other/debugging.html
+  Debugging Vagrant.
 https://www.vagrantup.com/docs/other/environmental-variables.html
   Environmental Variables. ``VAGRANT_LOG``.