Add reference to POSIX.

[pspp] / doc / headers / grp.texi

diff --git a/doc/headers/grp.texi b/doc/headers/grp.texi
index 098578be65d1717d432a410363b427f389b372aa..fe519db72d2165c36f996dfe6e094bb1378deffa 100644 (file)
--- a/doc/headers/grp.texi
+++ b/doc/headers/grp.texi
@@ -1,6 +1,8 @@
 @node grp.h
 @section @file{grp.h}
 
+POSIX specification: @url{http://www.opengroup.org/susv3xbd/grp.h.html}
+
 Gnulib module: ---
 
 Portability problems fixed by Gnulib: