diff --git a/Package.resolved b/Package.resolved
index 9240835..87953c9 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -6,8 +6,8 @@
         "repositoryURL": "https://github.com/luoxiu/Rainbow",
         "state": {
           "branch": null,
-          "revision": "177c6ebae4389c0363ea1bf62a7257151d53acbc",
-          "version": "0.0.4"
+          "revision": "438720f94da08582aff2abc4712de1c23f464d45",
+          "version": "0.0.5"
         }
       }
     ]
diff --git a/Package.swift b/Package.swift
index fdaa115..d8f307d 100644
--- a/Package.swift
+++ b/Package.swift
@@ -6,12 +6,14 @@ let package = Package(
     name: "Chalk",
     products: [
         .library(name: "Chalk", targets: ["Chalk"]),
+        .executable(name: "cli", targets: ["cli"]),
     ],
     dependencies: [
         .package(url: "https://github.com/luoxiu/Rainbow", from: "0.0.1"),
     ],
     targets: [
         .target(name: "Chalk", dependencies: ["Rainbow"]),
+        .target(name: "cli", dependencies: ["Chalk"]),
         .testTarget(name: "ChalkTests", dependencies: ["Chalk"]),
     ]
 )
diff --git a/README.md b/README.md
index 7e34ad1..5b85c1b 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@
 
 - Expressive API
 - 256/TrueColor support
-- Nestable
+- Ability to nest styles
 - Auto downgrading to terminal color support level
 - No extensions on `String`
 - Built-in 100+ handpicked colors
@@ -35,7 +35,7 @@ Chalk's API is very similar to [chalk](https://github.com/chalk/chalk) -- one of
 
 
 ```swift
-print(chalk.cyan.on("cyan"))  // `ck` is an alias to `chalk`
+print(Chalk.cyan.on("cyan"))  // `ck` is an alias to `chalk`
 
 // chainable
 print(ck.red.bgMagenta.bold.underline.on("red bgMagenta bild underline"))
@@ -49,7 +49,7 @@ print(ck.fg(.coral).bg(.lightGreen).bold.on("hi"))
 // rgb & hsl & hsv & hex support
 print(ck.fg(.rgb(0, 92, 197)).bg(.hex(0xf6f8fa)).underline.on("meow"))
 
-// nestable
+// nest
 print(ck.bgYellow.on("begin" + ck.red.bold.on("important") + "end"))
 print(ck.bgYellow.on("begin", ck.red.bold.on("important"), "end"))
 
diff --git a/Sources/cli/main.swift b/Sources/cli/main.swift
new file mode 100644
index 0000000..3fe2b46
--- /dev/null
+++ b/Sources/cli/main.swift
@@ -0,0 +1,27 @@
+//
+//  File.swift
+//  
+//
+//  Created by jinxiangqiu on 15/3/2020.
+//
+
+import Foundation
+import Chalk
+
+extension String {
+    
+    var success: String {
+        return ck.fg(.springGreen).on(self).description
+    }
+    
+    var failure: String {
+        return ck.fg(.red).on(self).description
+    }
+}
+
+func say(_ msg: String) {
+    print(ck.cyan.bold.on("Q:"), msg)
+}
+
+say("success".success)
+say("failure".failure)
diff --git a/Tests/ChalkTests/XCTestManifests.swift b/Tests/ChalkTests/XCTestManifests.swift
index 517dfb7..0bd8391 100644
--- a/Tests/ChalkTests/XCTestManifests.swift
+++ b/Tests/ChalkTests/XCTestManifests.swift
@@ -1,6 +1,6 @@
 import XCTest
 
-#if !os(macOS)
+#if !canImport(ObjectiveC)
 public func allTests() -> [XCTestCaseEntry] {
     return [
         testCase(ChalkTests.allTests),