Index: uspace/lib/ata/src/ata.c
===================================================================
--- uspace/lib/ata/src/ata.c	(revision 9739b5af8a6faa9400241c441fc23de1f57fdb18)
+++ uspace/lib/ata/src/ata.c	(revision 01d504978bc37b2e6e52acb18641bb8bfb13bd8f)
@@ -1037,4 +1037,13 @@
 }
 
+/** Transfer data using DMA during PACKET command.
+ *
+ * @param device Device
+ * @param buf Buffer
+ * @param buf_size Buffer size
+ * @param dir DMA direction
+ *
+ * @return EOK on success or an error code
+ */
 static errno_t ata_packet_dma(ata_device_t *device, void *buf, size_t buf_size,
     ata_dma_dir_t dir)