Index: uspace/srv/bd/ata_bd/ata_bd.c
===================================================================
--- uspace/srv/bd/ata_bd/ata_bd.c	(revision bb0eab1891f2101c5a0213a586259f5a5bca0a2a)
+++ uspace/srv/bd/ata_bd/ata_bd.c	(revision aa893e0c1c2438f546d8cc1d5ff8f9942998561c)
@@ -731,5 +731,5 @@
 }
 
-/** Send ATAPI Inquiry.
+/** Issue ATAPI Inquiry.
  *
  * @param dev_idx	Device index (0 or 1)
@@ -756,4 +756,17 @@
 }
 
+/** Issue ATAPI read(12) command.
+ *
+ * Output buffer must be large enough to hold the data, otherwise the
+ * function will fail.
+ *
+ * @param dev_idx	Device index (0 or 1)
+ * @param ba		Starting block address
+ * @param cnt		Number of blocks to read
+ * @param obuf		Buffer for storing inquiry data read from device
+ * @param obuf_size	Size of obuf in bytes
+ *
+ * @return EOK on success, EIO on error.
+ */
 static int ata_pcmd_read_12(int dev_idx, uint64_t ba, size_t cnt,
     void *obuf, size_t obuf_size)