diff --git a/shared-bindings/usb_cdc/Serial.c b/shared-bindings/usb_cdc/Serial.c
index 9fc5de21bcda1..1fd5ed4afcfdf 100644
--- a/shared-bindings/usb_cdc/Serial.c
+++ b/shared-bindings/usb_cdc/Serial.c
@@ -22,11 +22,15 @@
//| The available instances are in the ``usb_cdc.serials`` tuple."""
//| ...
//|
-//| def read(self, size: int = 1) -> bytes:
-//| """Read at most ``size`` bytes. If ``size`` exceeds the internal buffer size
-//| only the bytes in the buffer will be read. If `timeout` is > 0 or ``None``,
-//| and fewer than ``size`` bytes are available, keep waiting until the timeout
-//| expires or ``size`` bytes are available.
+//| def read(self, size: int = -1) -> bytes:
+//| """Read at most ``size`` bytes. If ``size`` exceeds the internal buffer size,
+//| only the bytes in the buffer will be read. If ``size`` is not specified or is ``-1``,
+//| read as many bytes as possible, until the timeout expires.
+//| If `timeout` is > 0 or ``None``, and fewer than ``size`` bytes are available,
+//| keep waiting until the timeout expires or ``size`` bytes are available.
+//|
+//| If no bytes are read, return ``b''``. This is unlike, say, `busio.UART.read()`, which
+//| would return ``None``.
//|
//| :return: Data read
//| :rtype: bytes"""
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