[PATCH] Help: thinktime is in microseconds

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/init.c b/init.c
index 5d6b0a9..374d10a 100644
--- a/init.c
+++ b/init.c
@@ -321,7 +321,7 @@
 		.name	= "thinktime",
 		.type	= FIO_OPT_INT,
 		.off1	= td_var_offset(thinktime),
-		.help	= "Idle time between IO buffers",
+		.help	= "Idle time between IO buffers (usec)",
 		.def	= "0",
 	},
 	{