diff --git a/README.md b/README.md
index 313dec1..1734214 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 ![Go version](https://img.shields.io/github/go-mod/go-version/iamando/welog)
 [![GoDoc](https://godoc.org/github.com/iamando/welog?status.svg)](https://godoc.org/github.com/iamando/welog)
 
-A simple and colourful logger module for golang with timestamp support.
+A simple and colorful logger module for golang with timestamp support.
 
 ## Install
 
@@ -24,8 +24,8 @@ import (
 
 
 func ExampleUsage() {
- // create a new logger with info level with basic mode or use `welog.Colourful` to use colourful mode
- logger := welog.GenerateLogger(Info, welog.Basic) // welog.Colourful
+ // create a new logger with info level with basic mode or use `welog.Colorful` to use colorful mode
+ logger := welog.GenerateLogger(Info, welog.Basic) // welog.Colorful
 
  // log some messages
  logger.Error("An error occurred")
diff --git a/constants.go b/constants.go
index 30bab69..940f46a 100644
--- a/constants.go
+++ b/constants.go
@@ -8,8 +8,8 @@ const (
 )
 
 const (
-	Basic     LogMode = "basic"
-	Colourful LogMode = "colorful"
+	Basic    LogMode = "basic"
+	Colorful LogMode = "colorful"
 )
 
 const TimestampFormat string = "2006-01-02 15:04:05"
diff --git a/docs/_config.yml b/docs/_config.yml
index 41d58e5..f41eafc 100644
--- a/docs/_config.yml
+++ b/docs/_config.yml
@@ -1,3 +1,3 @@
 theme: jekyll-theme-cayman
 title: welog
-description: a simple and colourful logger module for golang with timestamp support.
+description: a simple and colorful logger module for golang with timestamp support.
diff --git a/welog_test.go b/welog_test.go
index 686aa50..a6d5eef 100644
--- a/welog_test.go
+++ b/welog_test.go
@@ -40,10 +40,10 @@ func TestBasicMode(t *testing.T) {
 	}
 }
 
-func TestColourfulMode(t *testing.T) {
+func TestColorfulMode(t *testing.T) {
 	var buf bytes.Buffer
 
-	logger := GenerateLogger(Info, Colourful)
+	logger := GenerateLogger(Info, Colorful)
 
 	logger.SetOutput(&buf)