diff --git a/lib/libpmc/Makefile b/lib/libpmc/Makefile
index fbb503e64223..513977001cdd 100644
--- a/lib/libpmc/Makefile
+++ b/lib/libpmc/Makefile
@@ -7,7 +7,7 @@ INCS=	pmc.h pmclog.h
 
 WARNS?=	6
 
-MAN=	pmc.3 pmc_allocate.3 pmclog.3
+MAN=	pmc.3 pmc_allocate.3 pmc_disable.3 pmclog.3
 
 MLINKS+= \
 	pmc_allocate.3 pmc_release.3 \
@@ -16,8 +16,7 @@ MLINKS+= \
 	pmc.3 pmc_configure_logfile.3 \
 	pmc.3 pmc_cpuinfo.3 \
 	pmc.3 pmc_detach.3 \
-	pmc.3 pmc_disable.3 \
-	pmc.3 pmc_enable.3 \
+	pmc_disable.3 pmc_enable.3 \
 	pmc.3 pmc_event_names_of_class.3 \
 	pmc.3 pmc_flush_logfile.3 \
 	pmc.3 pmc_get_driver_stats.3 \
diff --git a/lib/libpmc/pmc_disable.3 b/lib/libpmc/pmc_disable.3
new file mode 100644
index 000000000000..f28d0b967a1e
--- /dev/null
+++ b/lib/libpmc/pmc_disable.3
@@ -0,0 +1,99 @@
+.\" Copyright (c) 2007 Joseph Koshy.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" This software is provided by Joseph Koshy ``as is'' and
+.\" any express or implied warranties, including, but not limited to, the
+.\" implied warranties of merchantability and fitness for a particular purpose
+.\" are disclaimed.  in no event shall Joseph Koshy be liable
+.\" for any direct, indirect, incidental, special, exemplary, or consequential
+.\" damages (including, but not limited to, procurement of substitute goods
+.\" or services; loss of use, data, or profits; or business interruption)
+.\" however caused and on any theory of liability, whether in contract, strict
+.\" liability, or tort (including negligence or otherwise) arising in any way
+.\" out of the use of this software, even if advised of the possibility of
+.\" such damage.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd November 20, 2007
+.Os
+.Dt PMC_ENABLE 3
+.Sh NAME
+.Nm pmc_disable ,
+.Nm pmc_enable
+.Nd administrative control of hardware performance counters
+.Sh LIBRARY
+.Lb libpmc
+.Sh SYNOPSIS
+.In pmc.h
+.Ft int
+.Fn pmc_disable "int cpu" "int pmc"
+.Ft int
+.Fn pmc_enable "int cpu" "int pmc"
+.Sh DESCRIPTION
+These functions allow specific hardware performance monitoring
+counters in a system to be disabled and enabled administratively.
+The hardware performance counters available on each CPU are numbered
+using small non-negative integers, in a system dependent manner.
+Disabled counters will not be available to applications for use.
+.Pp
+The invoking process needs to have the
+.Dv PRIV_PMC_MANAGE
+privilege to perform these operations.
+.Pp
+Function
+.Fn pmc_disable
+disables the hardware counter numbered by argument
+.Fa pmc
+on CPU number
+.Fa cpu .
+.Pp
+Function
+.Fn pmc_enable
+enables the hardware counter numbered by argument
+.Fa pmc
+on CPU number
+.Fa cpu .
+.Sh IMPLEMENTATION NOTES
+Hardware PMCs that are currently in use by applications cannot be
+disabled.
+Allocation of a process scope software PMC marks all
+hardware PMCs in the system with the same pmc number as being in-use.
+.Sh RETURN VALUES
+.Rv -std
+.Sh ERRORS
+A call to these functions may fail with the following errors:
+.Bl -tag -width Er
+.It Bq Er EBUSY
+Function
+.Fn pmc_disable
+specified a hardware PMC is currently in use.
+.It Bq Er EINVAL
+Arguments
+.Fa cpu
+or
+.Fa pmc
+were invalid.
+.It Bq Er ENXIO
+Argument
+.Fa cpu
+specified a disabled CPU.
+.It Bq Er EPERM
+The current process lacks sufficient privilege to perform this
+operation.
+.El
+.Sh SEE ALSO
+.Xr pmc 3 ,
+.Xr pmc_cpuinfo 3 ,
+.Xr pmc_pmcinfo 3 ,
+.Xr hwpmc 4 ,
+.Xr pmccontrol 8 ,
+.Xr priv_check 9
\ No newline at end of file