diff --git a/.gitignore b/.gitignore
index 2d9b9da..ed2d16b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,4 @@ __pycache__
 .coverage
 .hypothesis
 .direnv
+result
diff --git a/README.md b/README.md
index 02bda04..5b6b17f 100644
--- a/README.md
+++ b/README.md
@@ -6,26 +6,38 @@ for initiative!
 
 ```bash
 $ roll 2d20
-1 ..... 15
-2 .....  9
-total | 24
+throwing 2d20:
+1:	┆    8
+2:	┆    6
+total:	╰╶╶ 14
 
 $ roll 5d4+2
-1 .....  2
-2 .....  2
-3 .....  4
-4 .....  1
-5 .....  3
-mod ..  +2
-total | 14
+throwing 5d4+2:
+1:	┆    3
+2:	┆    4
+3:	┆    2
+4:	┆    4
+5:	┆    1
+mod:	┆   +2
+total:	╰╶╶ 16
+
+$ roll # defaults to 1d20
+throwing 1d20:
+1:	┆   20
+total:	╰╶╶ 20
+critical hit!
+
+$ roll advantage # or roll adv, roll a
+throwing 2d20 with advantage:
+1:	┆    3
+2:	┆   14
+total:	╰╶╶ 14
+
+$ roll disadvantage # or roll dis, roll d
+throwing 2d20 with disadvantage:
+1:	┆    1
+2:	┆   19
+total:	╰╶╶╶ 1
+critical miss!
 
-$ roll 1d20
-1 ..... 1
-total | 1
 ```
-
-## todo
-
-- [x] roll with (dis)advantage
-- [x] print criticals
-- [x] use property testing
diff --git a/flake.nix b/flake.nix
index c384b5a..725ac82 100644
--- a/flake.nix
+++ b/flake.nix
@@ -15,11 +15,22 @@
       systems = [ "x86_64-linux" "aarch64-linux" "aarch64-darwin" "x86_64-darwin" ];
       perSystem = { config, self', inputs', pkgs, system, ... }:
         let
-          package = pkgs.python3.pkgs.buildPythonApplication {
+          buildPkgs = builtins.attrValues {
+            inherit (pkgs.python311Packages)
+              hatchling
+              tomli
+              ;
+            hatch = pkgs.hatch.override {
+              python3 = pkgs.python311;
+            };
+          };
+          package = pkgs.python311.pkgs.buildPythonApplication {
             pname = "roll";
             version = "0.1.0";
             src = ./.;
             format = "pyproject";
+
+            nativeBuildInputs = buildPkgs;
           };
         in
         {
@@ -35,15 +46,7 @@
               ${config.pre-commit.installationScript}
               echo "welcome to your python project >~(:)=====--" 1>&2
             '';
-            nativeBuildInputs = builtins.attrValues {
-              inherit (pkgs.python311Packages)
-                hatchling
-                tomli
-                ;
-              hatch = pkgs.hatch.override {
-                python3 = pkgs.python311;
-              };
-            };
+            nativeBuildInputs = buildPkgs;
             buildInputs = builtins.attrValues {
               inherit (pkgs)
                 autoflake
@@ -54,6 +57,7 @@
               inherit (pkgs.python311Packages)
                 ipython
                 ;
+              roll = package;
             };
           };
         };