diff --git a/nixos/modules/services/misc/comfyui.nix b/nixos/modules/services/misc/comfyui.nix
index fd9d507eae1a..b7ecede1abd4 100644
--- a/nixos/modules/services/misc/comfyui.nix
+++ b/nixos/modules/services/misc/comfyui.nix
@@ -10,6 +10,10 @@ let
   # By default a StateDirectory is used; anything else needs its own directory and a hole in the unit's mount namespace.
   isDefaultDataDir = cfg.dataDir == "/var/lib/comfyui";
 
+  package = cfg.package.override (oldArgs: {
+    extraPackages = ps: (oldArgs.extraPackages or (_: [ ]) ps) ++ cfg.extraPackages ps;
+  });
+
   modelDrvs = map (m: {
     inherit m;
     drv = pkgs.fetchurl (lib.filterAttrs (n: _: n == "name" || n == "url" || n == "hash") m);
@@ -43,6 +47,14 @@ in
         '';
       };
 
+      finalPackage = lib.mkOption {
+        type = lib.types.package;
+        internal = true;
+        readOnly = true;
+        default = package;
+        description = "The final ComfyUI package which is being used in the service.";
+      };
+
       listen = lib.mkOption {
         type = with lib.types; listOf str;
         default = [
@@ -138,6 +150,21 @@ in
           Files placed manually in the `models` directory are left untouched.
         '';
       };
+
+      extraPackages = lib.mkOption {
+        type = lib.types.functionTo (lib.types.listOf lib.types.package);
+        default = _: [ ];
+        defaultText = lib.literalExpression "ps: with ps; [ ]";
+        example = lib.literalExpression ''
+          ps: with ps; [ comfyui-manager ]
+        '';
+        description = ''
+          List of packages to add to ComfyUI's Python environment.
+
+          A popular example is `python3Packages.comfyui-manager` for installing and
+          managing custom nodes from within ComfyUI.
+        '';
+      };
     };
   };
 
@@ -166,7 +193,7 @@ in
       preStart = ''
         for d in custom_nodes input output models; do
           if [[ ! -d "${cfg.dataDir}/$d" ]]; then
-            cp --no-preserve=all -r ${cfg.package}/share/comfyui/$d "${cfg.dataDir}/"
+            cp --no-preserve=all -r ${cfg.finalPackage}/share/comfyui/$d "${cfg.dataDir}/"
           fi
         done
 
@@ -183,7 +210,7 @@ in
       '';
 
       serviceConfig = {
-        ExecStart = "${lib.getExe cfg.package} ${lib.escapeShellArgs cfg.extraArgs}";
+        ExecStart = "${lib.getExe cfg.finalPackage} ${lib.escapeShellArgs cfg.extraArgs}";
         Group = "comfyui";
         Restart = "always";
         RestartSec = "5sec"; # don't crash loop immediately
diff --git a/pkgs/by-name/co/comfyui/package.nix b/pkgs/by-name/co/comfyui/package.nix
index b67123660b0e..b93e12f057d9 100644
--- a/pkgs/by-name/co/comfyui/package.nix
+++ b/pkgs/by-name/co/comfyui/package.nix
@@ -1,8 +1,8 @@
 {
   lib,
-  callPackage,
   common-updater-scripts,
   cudaPackages,
+  extraPackages ? (ps: [ ]),
   fetchFromGitHub,
   gnutar,
   gzip,
@@ -10,7 +10,6 @@
   makeBinaryWrapper,
   python3,
   stdenvNoCC,
-  withManager ? false,
   writeShellApplication,
   yq-go,
 }:
@@ -59,9 +58,7 @@ let
       transformers
       yarl
     ]
-    ++ lib.optionals withManager [
-      ps.comfyui-manager
-    ];
+    ++ extraPackages ps;
 
   pythonEnv = python.withPackages appDependencies;
 in
@@ -152,11 +149,6 @@ stdenvNoCC.mkDerivation (finalAttrs: {
         done < "$src/requirements.txt"
       '';
     });
-  }
-  // lib.optionalAttrs (!withManager) {
-    tests.withManager = callPackage ./package.nix {
-      withManager = true;
-    };
   };
 
   meta = {
@@ -167,6 +159,7 @@ stdenvNoCC.mkDerivation (finalAttrs: {
     mainProgram = "comfyui";
     maintainers = with lib.maintainers; [
       caniko
+      knightfemale
       SuperSandro2000
     ];
     platforms = lib.platforms.linux ++ lib.platforms.darwin;