Update _index.md

doc/content/_index.md

@@ -110,20 +110,30 @@ First, you need to instantiate wrapper-manager's lib. This can be done by pullin
 Wrapper-manager can be pulled in a classic (non-flake) setup for a devshell or nixos configuration, like so:
 
 ```nix
-# shell.nix , or configuration.nix
-
-# or {pkgs, config, ...}: if you are in NixOS...
+# shell.nix
 let
   pkgs = import <nixpkgs> {};
-
   # optionally, pin a commit instead of using master
   wrapper-manager = import (builtins.fetchTarball "https://github.com/viperML/wrapper-manager/archive/refs/heads/master.tar.gz") {
     inherit (pkgs) lib;
   };
 in
-  ...
+  mkShell { ..... }
 ```
 
+```nix
+# configuration.nix
+{ config, pkgs, lib, ... }: let
+  # optionally, pin a commit instead of using master
+  wrapper-manager = import (builtins.fetchTarball "https://github.com/viperML/wrapper-manager/archive/refs/heads/master.tar.gz") {
+    inherit (pkgs) lib;
+  };
+in {
+    .....
+}
+```
+
+
 ### Evaluating
 
 Now that you already have `wrapper-manager` in scope, you need to evaluate `wrapper-manager.lib`. The argument is an attrset with following elements:
@@ -208,4 +218,4 @@ https://github.com/viperML/wrapper-manager/issues
   - Changed the way wrapper.name.flags is handled so that every flag is escaped
 
 - 2023-08-12
-  - Added wrappers.name.renames option.
+  - Added wrappers.name.renames option.