diff --git a/README.md b/README.md
index 4d8ad34b36..edaf2f6ab8 100644
--- a/README.md
+++ b/README.md
@@ -10,8 +10,8 @@ Debian based Linux for ARM based single-board computers
 Supported build environment is **Ubuntu Bionic 18.04 x64** ([minimal iso image](http://archive.ubuntu.com/ubuntu/dists/bionic/main/installer-amd64/current/images/netboot/mini.iso)).
 
 - guest inside a [VirtualBox](https://www.virtualbox.org/wiki/Downloads) or other virtualization software,
-- guest managed by [Vagrant](https://www.vagrantup.com/). This uses Virtualbox (as above) but does so in an easily repeatable way. Please check the [Armbian with Vagrant README](https://docs.armbian.com/Developer-Guide_Using-Vagrant/) for a quick start HOWTO,
-- inside a [Docker](https://www.docker.com/), [systemd-nspawn](https://www.freedesktop.org/software/systemd/man/systemd-nspawn.html) or other container environment [(example)](https://github.com/armbian/build/pull/255#issuecomment-205045273),
+- guest managed by [Vagrant](https://docs.armbian.com/Developer-Guide_Using-Vagrant/). This uses Virtualbox (as above) but does so in an easily repeatable way,
+- inside a [Docker](https://docs.armbian.com/Developer-Guide_Building-with-Docker/), [systemd-nspawn](https://www.freedesktop.org/software/systemd/man/systemd-nspawn.html) or other container environment [(example)](https://github.com/armbian/build/pull/255#issuecomment-205045273),
 - running natively on a dedicated PC or a server (**not** recommended),
 - **20GB disk space** or more and **2GB RAM** or more available for the VM, container or native OS,
 - superuser rights (configured `sudo` or root access).