diff --git a/man3/confstr.3 b/man3/confstr.3
index 598e461e8..b2f409729 100644
--- a/man3/confstr.3
+++ b/man3/confstr.3
@@ -21,10 +21,11 @@
 .\" the source, must acknowledge the copyright and authors of this work.
 .\" License.
 .\" Modified Sat Jul 24 19:53:02 1993 by Rik Faith (faith@cs.unc.edu)
-.\" FIXME Since about glibc 2.3.2, many more values for 'name' are 
-.\"	supported, some of which are documented under 'info confstr'.
-.\"	See <bits/confname.h> for the rest.
+.\" FIXME Many more values for 'name' are supported, some of which 
+.\"	are documented under 'info confstr'.
+.\"	See <bits/confname.h> for the rest.  
 .\"	These should all be added to this page.
+.\"	See also the SUSv3 specification of confstr()
 .TH CONFSTR 3  1993-04-17 "GNU" "Linux Programmer's Manual"
 .SH NAME
 confstr \- get configuration dependent string variables
@@ -47,6 +48,14 @@ The
 argument is the system variable to be queried.
 The following variables are supported:
 .TP
+.BR _CS_GNU_LIBC_VERSION " (GNU C library only; since glibc 2.3.2)"
+A string which identifies the GNU C library version on this system
+(e.g, "glibc 2.3.4").
+.TP
+.BR _CS_GNU_LIBPTHREAD_VERSION " (GNU C library only; since glibc 2.3.2)"
+A string which identifies the POSIX implementation supplied by this
+C library (e.g, "NPTL 2.3.4" or "linuxthreads-0.10").
+.TP
 .B _CS_PATH
 A value for the
 .B PATH