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-rw-r--r--shared-bindings/busio/UART.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/shared-bindings/busio/UART.c b/shared-bindings/busio/UART.c
index 0939910dc..ee23ff055 100644
--- a/shared-bindings/busio/UART.c
+++ b/shared-bindings/busio/UART.c
@@ -147,7 +147,9 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(busio_uart___exit___obj, 4, 4, busio_
//| .. method:: read(nbytes=None)
//|
//| Read characters. If ``nbytes`` is specified then read at most that many
-//| bytes. Otherwise, read everything that has been buffered.
+//| bytes. Otherwise, read everything that arrives until the connection
+//| times out. Providing the number of bytes expected is highly recommended
+//| because it will be faster.
//|
//| :return: Data read
//| :rtype: bytes or None