diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2
index e462e2153..377b1d6d1 100644
--- a/man2/perf_event_open.2
+++ b/man2/perf_event_open.2
@@ -24,7 +24,7 @@
 .\" This document is based on the perf_event.h header file, the
 .\" tools/perf/design.txt file, and a lot of bitter experience.
 .\"
-.TH PERF_EVENT_OPEN 2 2013-12-21 "Linux" "Linux Programmer's Manual"
+.TH PERF_EVENT_OPEN 2 2014-01-23 "Linux" "Linux Programmer's Manual"
 .SH NAME
 perf_event_open \- set up performance monitoring
 .SH SYNOPSIS
@@ -1878,7 +1878,7 @@ is the amount of data actually dumped (can be less than
 .I weight
 If
 .B PERF_SAMPLE_WEIGHT
-is enabled, then a 64 bit value provided by the hardware
+is enabled, then a 64-bit value provided by the hardware
 is recorded that indicates how costly the event was.
 This allows expensive events to stand out more clearly
 in profiles.
@@ -1886,7 +1886,7 @@ in profiles.
 .I data_src
 If
 .B PERF_SAMPLE_DATA_SRC
-is enabled, then a 64 bit value is recorded that is made up of
+is enabled, then a 64-bit value is recorded that is made up of
 the following fields:
 .RS
 .TP 4