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-rw-r--r--shared-bindings/busio/SPI.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/shared-bindings/busio/SPI.c b/shared-bindings/busio/SPI.c
index dc136564d..add541aa7 100644
--- a/shared-bindings/busio/SPI.c
+++ b/shared-bindings/busio/SPI.c
@@ -207,6 +207,7 @@ MP_DEFINE_CONST_FUN_OBJ_1(busio_spi_unlock_obj, busio_spi_obj_unlock);
//| .. method:: SPI.write(buffer, \*, start=0, end=len(buffer))
//|
//| Write the data contained in ``buf``. Requires the SPI being locked.
+//| At least one byte must be written.
//|
//| :param bytearray buffer: buffer containing the bytes to write
//| :param int start: Index to start writing from
@@ -247,6 +248,7 @@ MP_DEFINE_CONST_FUN_OBJ_KW(busio_spi_write_obj, 2, busio_spi_write);
//| .. method:: SPI.readinto(buffer, \*, start=0, end=len(buffer), write_value=0)
//|
//| Read into the buffer specified by ``buf`` while writing zeroes. Requires the SPI being locked.
+//| At least one byte must be read.
//|
//| :param bytearray buffer: buffer to write into
//| :param int start: Index to start writing at