diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2
index 4de02673b..8b5b59a4d 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 2013-11-08 "Linux" "Linux Programmer's Manual"
+.TH PERF_EVENT_OPEN 2 2013-12-12 "Linux" "Linux Programmer's Manual"
 .SH NAME
 perf_event_open \- set up performance monitoring
 .SH SYNOPSIS
@@ -81,21 +81,21 @@ and
 .I cpu
 arguments allow specifying which process and CPU to monitor:
 .TP
-.BR pid==0 " and " cpu==\-1
+.BR "pid == 0" " and " "cpu == \-1"
 This measures the current process/thread on any CPU.
 .TP
-.BR pid==0 " and " cpu>=0
+.BR "pid == 0" " and " "cpu >= 0"
 This measures the current process/thread only 
 when running on the specified CPU.
 .TP
-.BR pid>0 " and " cpu==\-1
+.BR "pid > 0" " and " "cpu == \-1"
 This measures the specified process/thread on any CPU.
 .TP
-.BR pid>0 " and " cpu>=0
+.BR "pid > 0" " and " "cpu >= 0"
 This measures the specified process/thread only
 when running on the specified CPU.
 .TP
-.BR pid==\-1 " and " cpu>=0
+.BR "pid == \-1" " and " "cpu >= 0"
 This measures all processes/threads on the specified CPU.
 Measurements such as this require the
 .B CAP_SYS_ADMIN