diff --git a/man2/mlock.2 b/man2/mlock.2
index 07e3119a6..aa576a13a 100644
--- a/man2/mlock.2
+++ b/man2/mlock.2
@@ -24,7 +24,7 @@
 .\" Software Foundation, Inc., 59 Temple Place, Suite 330,
 .\" Boston, MA 02111, USA.
 .\"
-.TH MLOCK 2 2008-09-25 "Linux" "Linux Programmer's Manual"
+.TH MLOCK 2 2010-03-05 "Linux" "Linux Programmer's Manual"
 .SH NAME
 mlock, munlock, mlockall, munlockall \- lock and unlock memory
 .SH SYNOPSIS
@@ -283,6 +283,19 @@ down to the nearest page boundary.
 However, POSIX.1-2001 allows an implementation to require that
 .I addr
 is page aligned, so portable applications should ensure this.
+
+The
+.I VmLck
+field of the Linux-specific
+.I /proc/PID/status
+file shows how many kilobytes of memory the calling process has locked using
+.BR mlock (),
+.BR mlockall (),
+.BR shmctl (2)
+.BR SHM_LOCK ,
+and
+.BR mmap (2)
+.BR MAP_LOCKED .
 .SS "Limits and permissions"
 In Linux 2.6.8 and earlier,
 a process must be privileged
@@ -326,4 +339,5 @@ resource limit is encountered.
 .BR setrlimit (2),
 .BR shmctl (2),
 .BR sysconf (3),
+.BR proc (5),
 .BR capabilities (7)