diff --git a/README.md b/README.md
index d7b8c9c..0e3c6ea 100644
--- a/README.md
+++ b/README.md
@@ -50,3 +50,4 @@ Initial password for `user` is `user`.
 
     sudo nix-channel --add https://nixos.org/channels/nixos-unstable unstable
     sudo nix-channel --add https://nixos.org/channels/nixos-20.03-small nixos-small
+    sudo nix-channel --update