1 files changed, 1 insertions, 1 deletions

diff --git a/examples/stm32f4/src/bin/usb_serial.rs b/examples/stm32f4/src/bin/usb_serial.rs
index 3ab9a6c56..3e05b0ef2 100644
--- a/examples/stm32f4/src/bin/usb_serial.rs
+++ b/examples/stm32f4/src/bin/usb_serial.rs
@@ -77,7 +77,7 @@ async fn main(_spawner: Spawner) {
         &mut device_descriptor,
         &mut config_descriptor,
         &mut bos_descriptor,
-        &mut [],
+        &mut [], // no msos descriptors
         &mut control_buf,
     );