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diff --git a/original/man3/acos.3 b/original/man3/acos.3
index 39c74912..4145505c 100644
--- a/original/man3/acos.3
+++ b/original/man3/acos.3
@@ -2,6 +2,7 @@
 .\" and Copyright 2008, Linux Foundation, written by Michael Kerrisk
 .\"     <mtk.manpages@gmail.com>
 .\"
+.\" %%%LICENSE_START(VERBATIM)
 .\" Permission is granted to make and distribute verbatim copies of this
 .\" manual provided the copyright notice and this permission notice are
 .\" preserved on all copies.
@@ -21,6 +22,7 @@
 .\"
 .\" Formatted or processed versions of this manual, if unaccompanied by
 .\" the source, must acknowledge the copyright and authors of this work.
+.\" %%%LICENSE_END
 .\"
 .\" References consulted:
 .\"     Linux libc source code
@@ -30,7 +32,7 @@
 .\" Modified 2002-07-25 by Walter Harms
 .\" 	(walter.harms@informatik.uni-oldenburg.de)
 .\"
-.TH ACOS 3  2008-08-05 "" "Linux Programmer's Manual"
+.TH ACOS 3  2010-09-20 "" "Linux Programmer's Manual"
 .SH NAME
 acos, acosf, acosl \- arc cosine function
 .SH SYNOPSIS
@@ -52,15 +54,23 @@ Feature Test Macro Requirements for glibc (see
 .ad l
 .BR acosf (),
 .BR acosl ():
-_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE; or
+.RS 4
+_BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE ||
+_POSIX_C_SOURCE\ >=\ 200112L;
+.br
+or
 .I cc\ -std=c99
+.RE
 .ad b
 .SH DESCRIPTION
 The
 .BR acos ()
-function calculates the arc cosine of \fIx\fP; that is
-the value whose cosine is \fIx\fP.
-.SH "RETURN VALUE"
+function calculates the arc cosine of
+.IR x ;
+that is
+the value whose cosine is
+.IR x .
+.SH RETURN VALUE
 On success, these functions return the arc cosine of
 .IR x
 in radians; the return value is in the range [0,\ pi].
@@ -100,13 +110,13 @@ is set to
 An invalid floating-point exception
 .RB ( FE_INVALID )
 is raised.
-.SH "CONFORMING TO"
+.SH CONFORMING TO
 C99, POSIX.1-2001.
 The variant returning
 .I double
 also conforms to
 SVr4, 4.3BSD, C89.
-.SH "SEE ALSO"
+.SH SEE ALSO
 .BR asin (3),
 .BR atan (3),
 .BR atan2 (3),
@@ -114,3 +124,12 @@ SVr4, 4.3BSD, C89.
 .BR cos (3),
 .BR sin (3),
 .BR tan (3)
+.SH COLOPHON
+This page is part of release 3.79 of the Linux
+.I man-pages
+project.
+A description of the project,
+information about reporting bugs,
+and the latest version of this page,
+can be found at
+\%http://www.kernel.org/doc/man\-pages/.