diff --git a/fio.1 b/fio.1
index 0baa429..5e97f66 100644
--- a/fio.1
+++ b/fio.1
@@ -940,7 +940,7 @@
 Overwrite the default list of percentiles for completion
 latencies. Each number is a floating number in the range (0,100], and
 the maximum length of the list is 20. Use ':' to separate the
-numbers. For example, --percentile_list=99.5:99.9 will cause fio to
+numbers. For example, \-\-percentile_list=99.5:99.9 will cause fio to
 report the values of completion latency below which 99.5% and 99.9% of
 the observed latencies fell, respectively.
 .SH OUTPUT