diff --git a/examples/usb_phy_serial_interrupt.rs b/examples/usb_phy_serial_interrupt.rs
index 68d2d83c..dff0fee7 100644
--- a/examples/usb_phy_serial_interrupt.rs
+++ b/examples/usb_phy_serial_interrupt.rs
@@ -1,4 +1,7 @@
 //! CDC-ACM serial port example using an external phy and interrupts
+//!
+//! This example is for RM0433/RM0399 parts. It has been tested on the Arduino
+//! Portenta H7
 #![no_std]
 #![no_main]
 
diff --git a/examples/usb_serial.rs b/examples/usb_serial.rs
index 1a08b470..892e15f6 100644
--- a/examples/usb_serial.rs
+++ b/examples/usb_serial.rs
@@ -59,7 +59,7 @@ fn main() -> ! {
     #[cfg(any(feature = "rm0455", feature = "rm0468"))]
     let (pin_dm, pin_dp) = {
         let gpioa = dp.GPIOA.split(ccdr.peripheral.GPIOA);
-        (gpioa.pa11.into_alternate(), gpioa.pa12.into_alternate())
+        (gpioa.pa11, gpioa.pa12)
     };
 
     let usb = USB1::new(