diff --git a/option.go b/option.go
index abce19a..0352d37 100644
--- a/option.go
+++ b/option.go
@@ -206,6 +206,14 @@ func OptionSwitchKeyBindMode(m KeyBindMode) Option {
 	}
 }
 
+// OptionCompletionOnDown allows for Down arrow key to trigger completion.
+func OptionCompletionOnDown() Option {
+	return func(p *Prompt) error {
+		p.completionOnDown = true
+		return nil
+	}
+}
+
 // SwitchKeyBindMode to set a key bind mode.
 // Deprecated: Please use OptionSwitchKeyBindMode.
 var SwitchKeyBindMode = OptionSwitchKeyBindMode
diff --git a/prompt.go b/prompt.go
index 4e3ef43..e910a29 100644
--- a/prompt.go
+++ b/prompt.go
@@ -25,6 +25,7 @@ type Prompt struct {
 	keyBindings       []KeyBind
 	ASCIICodeBindings []ASCIICodeBind
 	keyBindMode       KeyBindMode
+	completionOnDown  bool
 }
 
 // Exec is the struct contains user input context.
@@ -148,7 +149,7 @@ func (p *Prompt) feed(b []byte) (shouldExit bool, exec *Exec) {
 func (p *Prompt) handleCompletionKeyBinding(key Key, completing bool) {
 	switch key {
 	case Down:
-		if completing {
+		if completing || p.completionOnDown {
 			p.completion.Next()
 		}
 	case Tab, ControlI: