diff --git a/README.md b/README.md
index bdd724b..5c4415f 100644
--- a/README.md
+++ b/README.md
@@ -184,7 +184,12 @@ pass.withExtensions (exts: [ exts.pass-otp ])
 ```
 
 The above can be installed imperatively via `nix-env` or ran in a temprorary
-environment via `nix-shell`.
+environment via `nix-shell`, or added to configuration.nix like this:
+```nix
+environment.systemPackages = with pkgs; [
+  (pass.withExtensions (exts: [ exts.pass-otp ]))
+];
+```
 
 ### macOS
 #### Brew