diff --git a/lib/std/Io.zig b/lib/std/Io.zig
index f3ef2757acad16f3dc4e548cc25d1172ba47e032..269372f12ec3a2ebc4f5dae810be15736b7dd5d4 100644
--- a/lib/std/Io.zig
+++ b/lib/std/Io.zig
@@ -1139,6 +1139,7 @@ pub const Duration = struct {
 
 /// Declares under what conditions an operation should return `error.Timeout`.
 pub const Timeout = union(enum) {
+    /// `.none` will wait forever
     none,
     duration: Clock.Duration,
     deadline: Clock.Timestamp,
diff --git a/lib/std/Io/Threaded.zig b/lib/std/Io/Threaded.zig
index 037fce335064106b7b8051b94d3380e3138f54d5..8180a57dc5f3a73ecf3f9425d1bc69fbdd89b25d 100644
--- a/lib/std/Io/Threaded.zig
+++ b/lib/std/Io/Threaded.zig
@@ -11711,7 +11711,6 @@ fn nowWasi(clock: Io.Clock) Io.Timestamp {
 
 fn sleep(userdata: ?*anyopaque, timeout: Io.Timeout) Io.Cancelable!void {
     const t: *Threaded = @ptrCast(@alignCast(userdata));
-    if (timeout == .none) return;
     if (use_parking_sleep) return parking_sleep.sleep(timeout);
     if (native_os == .wasi) return sleepWasi(t, timeout);
     if (@TypeOf(posix.system.clock_nanosleep) != void) return sleepPosix(timeout);