Whilst working on the previous patch, the existing comment was not enough to
document when the TI command codepath was being used. Update and improve the
comment accordingly.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
---
 hw/scsi/esp.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c
index 5723290d62..36e92dcd7b 100644
--- a/hw/scsi/esp.c
+++ b/hw/scsi/esp.c
@@ -1032,8 +1032,9 @@ void esp_transfer_data(SCSIRequest *req, uint32_t len)
         case CMD_TI | CMD_DMA:
         case CMD_TI:
             /*
-             * Bus service interrupt raised because of initial change to
-             * DATA phase
+             * If the final COMMAND phase data was transferred using a TI
+             * command, clear ESP_CMD to terminate the TI command and raise
+             * the completion interrupt
              */
             s->rregs[ESP_CMD] = 0;
             s->rregs[ESP_RINTR] |= INTR_BS;
-- 
2.39.5