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diff --git a/HOWTO b/HOWTO
index 237b3ad2..06408e40 100644
--- a/HOWTO
+++ b/HOWTO
@@ -253,6 +253,14 @@ bs_unaligned	If this option is given, any byte size value within bsrange
 
 nrfiles=int	Number of files to use for this job. Defaults to 1.
 
+file_service_type=str  Defines how fio decides which file from a job to
+		service next. The following types are defined:
+
+			random	Just choose a file at random.
+
+			roundrobin  Round robin over open files. This
+				is the default.
+
 ioengine=str	Defines how the job issues io to the file. The following
 		types are defined:
 
@@ -289,11 +297,20 @@ ioengine=str	Defines how the job issues io to the file. The following
 				or receive, if the latter only the port
 				argument is used.
 
+			external Prefix to specify loading an external
+				IO engine object file. Append the engine
+				filename, eg ioengine=external:/tmp/foo.o
+				to load ioengine foo.o in /tmp.
+
 iodepth=int	This defines how many io units to keep in flight against
 		the file. The default is 1 for each file defined in this
 		job, can be overridden with a larger value for higher
 		concurrency.
 
+iodepth_batch=int This defines how many pieces of IO to submit at once.
+		It defaults to the same as iodepth, but can be set lower
+		if one so desires.
+
 iodepth_low=int	The low water mark indicating when to start filling
 		the queue again. Defaults to the same as iodepth, meaning
 		that fio will attempt to keep the queue full at all times.