diff --git a/HOWTO b/HOWTO
index 6ac744c..f5e2449 100644
--- a/HOWTO
+++ b/HOWTO
@@ -362,6 +362,10 @@
 			mmap	Use anonymous memory maps as the buffers.
 				Allocated through mmap(2).
 
+			mmaphuge Use a memory mapped huge file as the buffer
+				backing. Append filename after mmaphuge, ala
+				mem=mmaphuge:/hugetlbfs/file
+
 		The area allocated is a function of the maximum allowed
 		bs size for the job, multiplied by the io depth given.