diff --git a/nixos/doc/manual/README b/nixos/doc/manual/README
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+To build the manual, you need Nix installed on your system (no need
+for NixOs). To install Nix, follow the instructions at
+
+    https://nixos.org/nix/download.html
+
+When you have Nix on your system, in the root directory of the project
+(i.e., `nixpkgs`), run:
+
+    nix-build nixos/release.nix -A manual.x86_64-linux
+
+When this command successfully finishes, it will tell you were the
+manual got generated.
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