diff --git a/README.md b/README.md
index 0dcd89e..df2f13b 100644
--- a/README.md
+++ b/README.md
@@ -31,6 +31,7 @@ nix-env -f https://github.com/nix-community/nixos-generators/archive/master.tar.
 format | description
 --- | ---
 azure | Microsoft azure image
+do | Digital Ocean image
 gce | Google Compute Image
 install-iso | Installer ISO
 install-iso-hyperv | Installer ISO with enabled hyper-v support
@@ -53,6 +54,15 @@ sd-aarch64 | Like sd-aarch64-installer, but does not use default installer image
 
 Run `nixos-generate --help` for detailed usage information.
 
+## Using a particular nixpkgs
+
+To use features found in a different nixpkgs (for instance the Digital Ocean
+image was recently merged in nixpkgs):
+
+```
+NIX_PATH=nixpkgs=../nixpkgs nixos-generate -f do
+```
+
 ## Cross Compiling
 
 To cross compile nixos images for other system you have
diff --git a/formats/do.nix b/formats/do.nix
new file mode 100644
index 0000000..8b5d0e3
--- /dev/null
+++ b/formats/do.nix
@@ -0,0 +1,8 @@
+{ modulesPath, ... }:
+{
+  imports = [
+    "${toString modulesPath}/virtualisation/digital-ocean-image.nix"
+  ];
+
+  formatAttr = "digitalOceanImage";
+}