it works :D

flake.nix

@@ -7,7 +7,7 @@
 		# NixOS official package source, using the nixos-26.05 branch here
 		nixpkgs.url = "github:nixos/nixpkgs/nixos-26.05";
 		nixpkgs-unstable.url = "github:nixos/nixpkgs/nixos-unstable";
-		helium = {
+		helium-browser = {
 			url = "github:schembriaiden/helium-browser-nix-flake";
 			inputs.nixpkgs.follows = "nixpkgs";
 		};
@@ -15,6 +15,10 @@
 			url = "github:nix-community/home-manager/release-26.05";
 			inputs.nixpkgs.follows = "nixpkgs";
 		};
+		nixvim = {
+      			url = "github:nix-community/nixvim/nixos-26.05";
+      			inputs.nixpkgs.follows = "nixpkgs";
+    		};
 		flake-parts.url = "github:hercules-ci/flake-parts";
 		flake-file.url = "github:vic/flake-file";
 		import-tree.url = "github:vic/import-tree";