diff --git a/asusctl/src/cli_opts.rs b/asusctl/src/cli_opts.rs
index 45d8de2b..03305f83 100644
--- a/asusctl/src/cli_opts.rs
+++ b/asusctl/src/cli_opts.rs
@@ -70,7 +70,7 @@ pub struct BiosCommand {
         meta = "",
         short = "S",
         no_long,
-        help = "set bios POST sound: asusctl -p <true/false>"
+        help = "set bios POST sound: asusctl -S <true/false>"
     )]
     pub post_sound_set: Option<bool>,
     #[options(no_long, short = "s", help = "read bios POST sound")]