diff --git a/README.md b/README.md
index e3de39f..c5918e5 100644
--- a/README.md
+++ b/README.md
@@ -67,7 +67,7 @@ zone2="x=10,y=10,width=10,height=10" --message zone1="Hello {scrolloff}"
 - `--display_delay`: Message display delay in milliseconds. Default is 0.
 - `--display_repeat`: Not really sure. The default is 0.
 - `--ttl`: The message will self-destruct in x seconds. Default is 0.
-- `sound_alarm`: If true, the sign will beep when the message is displayed.
+- `--sound_alarm`: If true, the sign will beep when the message is displayed.
 
 ### Message Formatting