diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 4bcd744a5c85560d545c96af0c827bd99b332104..c092b1be38d7003f4b3fc806e8fc8314cbc61352 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -999,8 +999,11 @@ static inline bool scsi_cmd_needs_dma_drain(struct scsi_device *sdev,
 }
 
 /**
- * scsi_alloc_sgtables - allocate S/G tables for a command
- * @cmd:  command descriptor we wish to initialize
+ * scsi_alloc_sgtables - Allocate and initialize data and integrity scatterlists
+ * @cmd: SCSI command data structure to initialize.
+ *
+ * Initializes @cmd->sdb and also @cmd->prot_sdb if data integrity is enabled
+ * for @cmd.
  *
  * Returns:
  * * BLK_STS_OK       - on success