diff --git a/pi-calendar-sign.py b/pi-calendar-sign.py
index 1f76180..6ce4c6e 100644
--- a/pi-calendar-sign.py
+++ b/pi-calendar-sign.py
@@ -41,6 +41,7 @@ def format_text(text):
 
 def update_display(color, text, cursor = False, blink = False):
     text = format_text(text)
+    lcd.clear()
     lcd.color = color
     lcd.message = text
     lcd.cursor = cursor