diff --git a/bookwyrm.nix b/bookwyrm.nix
index dfec431..66e03ec 100644
--- a/bookwyrm.nix
+++ b/bookwyrm.nix
@@ -116,6 +116,17 @@ mkDerivation {
 
 		chmod +x $out/bin/bookwyrm
 
+		# Systemd units
+
+		cat <<- EOF > $out/lib/systemd/system/bookwyrm.service
+			[Unit]
+			After=network.target
+
+			[Service]
+			ExecStart=$out/bin/bookwyrm
+			WorkingDirectory=/var/lib/bookwyrm
+		EOF
+
 		runHook postInstall
 	'' ;
 }
diff --git a/nixos-module.nix b/nixos-overlay.nix
similarity index 84%
rename from nixos-module.nix
rename to nixos-overlay.nix
index b90ef12..5a527a3 100644
--- a/nixos-module.nix
+++ b/nixos-overlay.nix
@@ -51,19 +51,4 @@
 			)
 		] ;
 	} ;
-
-	systemd = {
-		units = {
-			bookwyrm = {
-				text = ''
-					[Unit]
-					After=network.target
-
-					[Service]
-					ExecStart=$out/bin/bookwyrm
-					WorkingDirectory=/var/lib/bookwyrm
-				'' ;
-			} ;
-		} ;
-	} ;
 }
diff --git a/readme.md b/readme.md
index d6bec7c..d4567d4 100644
--- a/readme.md
+++ b/readme.md
@@ -3,7 +3,7 @@
 ## Description
 
 An assortment of Nix packages not in the official collection.
-They can either be imported individually or using the module if you're on NixOS.
+They can either be imported individually or using the overlay if you're on NixOS.
 
 These are purposefully written without support for [overriding](https://nixos.org/guides/nix-pills/17-nixpkgs-overriding-packages) in order to minimise complexity.
 If you want to build upon them I encourage you to fork this repository.
@@ -23,13 +23,13 @@ pkgs . callPackage ( import ( pkgs . fetchurl {
 } ) ) {}
 ```
 
-Using the NixOS module:
+Using the NixOS overlay:
 
 ```nix
 imports = [
 	( fetchTarball {
 		url = "https://kernelmaft.com/forgejo/zedfrigg/nix-packages/archive/432123bb0984dd766c16ac06b7e3ef4cfee36145.tar.gz" ;
 		sha256 = "sha256:1wx7ljabgndandcd11jmr590jfpkhs55mqrgksf24ji90m37wpq0" ;
-	} + "/nixos-module.nix" )
+	} + "/nixos-overlay.nix" )
 ] ;
 ```