README: mention why install_url is useful

cachix · Sep 21, 2020 · aee3ec7 · aee3ec7
1 parent ba5c343
commit aee3ec7
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/README.md b/README.md
@@ -66,7 +66,7 @@ jobs:
 
 ## Inputs (specify using `with:`)
 
-- `install_url`: specify URL to install Nix from (useful for testing non-stable releases)
+- `install_url`: specify URL to install Nix from (useful for testing non-stable releases or pinning Nix for example https://releases.nixos.org/nix/nix-2.3.7/install)
 
 - `nix_path`: set `NIX_PATH` environment variable, for example `nixpkgs=channel:nixos-unstable`