diff --git a/fio.1 b/fio.1
index 6c3dd21..82d05b7 100644
--- a/fio.1
+++ b/fio.1
@@ -426,6 +426,12 @@
 the remaining zeroed. With this set to some chunk size smaller than the block
 size, fio can alternate random and zeroed data throughout the IO buffer.
 .TP
+.BI buffer_pattern \fR=\fPstr
+If set, fio will fill the io buffers with this pattern. If not set, the contents
+of io buffers is defined by the other options related to buffer contents. The
+setting can be any pattern of bytes, and can be prefixed with 0x for hex
+values.
+.TP
 .BI nrfiles \fR=\fPint
 Number of files to use for this job.  Default: 1.
 .TP