diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index c8bb680..176f6e3 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -289,7 +289,7 @@
  * the data being transferred; that may reduce overhead, when the
  * underlying driver uses dma.
  *
- * If the transmit buffer is null, undefined data will be shifted out
+ * If the transmit buffer is null, zeroes will be shifted out
  * while filling rx_buf.  If the receive buffer is null, the data
  * shifted in will be discarded.  Only "len" bytes shift out (or in).
  * It's an error to try to shift out a partial word.  (For example, by