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-rw-r--r--src/device.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/device.c b/src/device.c
index 9bfaf776d6..4e1abbeb6f 100644
--- a/src/device.c
+++ b/src/device.c
@@ -307,7 +307,7 @@ RTM_EXPORT(rt_device_close);
*
* @param size is the size of buffer.
*
- * @return the actually read size on successful, otherwise negative returned.
+ * @return the actually read size on successful, otherwise zero returned.
*
* @note since 0.4.0, the unit of size/pos is a block for block device.
*/
@@ -350,7 +350,7 @@ RTM_EXPORT(rt_device_read);
*
* @param size is the size of buffer.
*
- * @return the actually written size on successful, otherwise negative returned.
+ * @return the actually written size on successful, otherwise zero returned.
*
* @note since 0.4.0, the unit of size/pos is a block for block device.
*/