diff --git a/cli/src/args.rs b/cli/src/args.rs
index c9f3175..4c97709 100644
--- a/cli/src/args.rs
+++ b/cli/src/args.rs
@@ -130,6 +130,7 @@ pub fn get_args() -> Result<ArgMatches<'static>> {
 		.arg(Arg::with_name("watch-when-idle")
 			.help("Deprecated alias for --on-busy-update=do-nothing, which will become the default in 2.0.")
 			.short("W")
+			.hidden(true)
 			.long("watch-when-idle"))
 		.arg(Arg::with_name("notif") // TODO
 			.help("Send a desktop notification when watchexec notices a change (experimental, behaviour may change)")
diff --git a/cli/tests/snapshots/help__help_unix.snap b/cli/tests/snapshots/help__help_unix.snap
index a6abada..077142d 100644
--- a/cli/tests/snapshots/help__help_unix.snap
+++ b/cli/tests/snapshots/help__help_unix.snap
@@ -26,7 +26,6 @@ FLAGS:
     -r, --restart              Restart the process if it's still running. Shorthand for --on-busy-update=restart
     -V, --version              Prints version information
     -v, --verbose              Print debugging messages (-v, -vv, -vvv; use -vvv for bug reports)
-    -W, --watch-when-idle      Deprecated alias for --on-busy-update=do-nothing, which will become the default in 2.0.
 
 OPTIONS:
     -d, --debounce <milliseconds>            Set the timeout between detected change and command execution, defaults to
diff --git a/cli/tests/snapshots/help__help_windows.snap b/cli/tests/snapshots/help__help_windows.snap
index 3c96ad0..6e0be6a 100644
--- a/cli/tests/snapshots/help__help_windows.snap
+++ b/cli/tests/snapshots/help__help_windows.snap
@@ -27,7 +27,6 @@ FLAGS:
     -r, --restart              Restart the process if it's still running. Shorthand for --on-busy-update=restart
     -V, --version              Prints version information
     -v, --verbose              Print debugging messages (-v, -vv, -vvv; use -vvv for bug reports)
-    -W, --watch-when-idle      Deprecated alias for --on-busy-update=do-nothing, which will become the default in 2.0.
 
 OPTIONS:
     -d, --debounce <milliseconds>            Set the timeout between detected change and command execution, defaults to