diff --git a/V2/sleep/src/main.rs b/V2/sleep/src/main.rs
index 391348a..7ed1183 100644
--- a/V2/sleep/src/main.rs
+++ b/V2/sleep/src/main.rs
@@ -103,7 +103,7 @@ fn main() {
         ap.refer(&mut step).add_option(&["--step"], Store, "Sleep period step size");
         ap.refer(&mut count).add_option(&["--loop"], Store, "Count of measurements per period");
         #[cfg(target_os = "linux")]
-        ap.refer(&mut realtime).add_option(&["--rt"], StoreTrue, "Output file");
+        ap.refer(&mut realtime).add_option(&["--rt"], StoreTrue, "Set realtime priority");
         ap.refer(&mut output).add_option(&["-o", "--out"], Store, "Output file");
         ap.add_option(&["-V", "--version"],
                       Print(env!("CARGO_PKG_VERSION").to_string()),