diff --git a/man2/setreuid.2 b/man2/setreuid.2
index 7e5613122..82681f186 100644
--- a/man2/setreuid.2
+++ b/man2/setreuid.2
@@ -40,7 +40,7 @@
 .\"          2004-07-04 by aeb
 .\"          2004-05-27 by Michael Kerrisk
 .\"
-.TH SETREUID 2 2010-09-20 "Linux" "Linux Programmer's Manual"
+.TH SETREUID 2 2010-11-22 "Linux" "Linux Programmer's Manual"
 .SH NAME
 setreuid, setregid \- set real and/or effective user or group ID
 .SH SYNOPSIS
@@ -138,6 +138,22 @@ across implementations.
 
 POSIX.1 makes no specification about the effect of these calls
 on the saved set-user-ID and saved set-group-ID.
+
+The original Linux
+.BR setreuid ()
+and
+.BR setregid ()
+system calls supported only 16-bit user and group IDs.
+Subsequently, Linux 2.4 added 
+.BR setreuid32 ()
+and
+.BR setregid32 (),
+supporting 32-bit IDs.
+The glibc
+.BR setreuid ()
+and
+.BR setregid ()
+wrapper functions transparently deal with the variations across kernel versions.
 .SH "SEE ALSO"
 .BR getgid (2),
 .BR getuid (2),