locale.7: Document LC_MEASUREMENT

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man7/locale.7

@@ -1,4 +1,5 @@
 .\" Copyright (c) 1993 by Thomas Koenig (ig25@rz.uni-karlsruhe.de)
+.\" and Copyright (C) 2014 Michael Kerrisk <mtk.manpages@gmail.com>
 .\"
 .\" %%%LICENSE_START(VERBATIM)
 .\" Permission is granted to make and distribute verbatim copies of this
@@ -124,6 +125,16 @@ functions also obey the environment variable
 if the category is set to a valid locale other than
 .BR """C""" .
 .TP
+.BR LC_MEASUREMENT " (GNU extension, since glibc 2.2)"
+Change the settings relating to the measurement system in the locale
+(i.e., metric versus US customary units).
+Applications can use
+.BR nl_langinfo (3)
+to retrieve the nonstandard
+.B _NL_MEASUREMENT_MEASUREMENT
+element, which returns a pointer to a character
+that has the value 1 (metric) or 2 (US customary units).
+.TP
 .BR LC_NAME " (GNU extension, since glibc 2.2)"
 Change settings that describe the formats used to address persons.
 Applications that need this information can use
@@ -182,9 +193,6 @@ example, most of Europe uses a 24-hour clock versus the
 .TP
 .B LC_ALL
 All of the above.
-.\" FIXME glibc 2.2 added new nonstandard locale categories:
-.\" LC_IDENTIFICATION, LC_MEASUREMENT, LC_NAME.
-.\" These need to be documented.
 .PP
 If the second argument to
 .BR setlocale (3)