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-rw-r--r--stmhal/usb.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/stmhal/usb.h b/stmhal/usb.h
index 5153cb5fab..6d2d469fe9 100644
--- a/stmhal/usb.h
+++ b/stmhal/usb.h
@@ -48,7 +48,7 @@ void pyb_usb_dev_stop(void);
bool usb_vcp_is_enabled(void);
bool usb_vcp_is_connected(void);
void usb_vcp_set_interrupt_char(int c);
-int usb_vcp_recv_byte(uint8_t *c);
+int usb_vcp_recv_byte(uint8_t *c); // if a byte is available, return 1 and put the byte in *c, else return 0
void usb_vcp_send_strn(const char* str, int len);
void usb_vcp_send_strn_cooked(const char *str, int len);
void usb_hid_send_report(uint8_t *buf); // 4 bytes for mouse: ?, x, y, ?