diff --git a/option.go b/option.go
index 86e6252..f14aa19 100644
--- a/option.go
+++ b/option.go
@@ -15,7 +15,7 @@ func OptionParser(x ConsoleParser) Option {
 // OptionWriter to set a custom ConsoleWriter object. An argument should implement ConsoleWriter interface.
 func OptionWriter(x ConsoleWriter) Option {
 	return func(p *Prompt) error {
-		RegisterConsoleWriter(x)
+		registerConsoleWriter(x)
 		p.renderer.out = x
 		return nil
 	}
@@ -229,7 +229,7 @@ func OptionAddASCIICodeBind(b ...ASCIICodeBind) Option {
 // New returns a Prompt with powerful auto-completion.
 func New(executor Executor, completer Completer, opts ...Option) *Prompt {
 	defaultWriter := NewStandardOutputWriter()
-	RegisterConsoleWriter(defaultWriter)
+	registerConsoleWriter(defaultWriter)
 
 	pt := &Prompt{
 		in: NewStandardInputParser(),
diff --git a/output.go b/output.go
index 0e03270..42531b4 100644
--- a/output.go
+++ b/output.go
@@ -7,7 +7,7 @@ var (
 	consoleWriter   ConsoleWriter
 )
 
-func RegisterConsoleWriter(f ConsoleWriter) {
+func registerConsoleWriter(f ConsoleWriter) {
 	consoleWriterMu.Lock()
 	defer consoleWriterMu.Unlock()
 	consoleWriter = f