diff --git a/man2/readdir.2 b/man2/readdir.2
index f9a6c5828..d5443a429 100644
--- a/man2/readdir.2
+++ b/man2/readdir.2
@@ -27,7 +27,7 @@
 .\"   In 1.3.X, returns only one entry each time; return value is different.
 .\" Modified 2004-12-01, mtk, fixed headers listed in SYNOPSIS
 .\"
-.TH READDIR 2  2012-07-13 "Linux" "Linux Programmer's Manual"
+.TH READDIR 2  2013-03-26 "Linux" "Linux Programmer's Manual"
 .SH NAME
 readdir \- read directory entry
 .SH SYNOPSIS
@@ -122,6 +122,8 @@ structure yourself.
 However, probably you should use
 .BR readdir (3)
 instead.
+
+This system call does not exist on x86-64.
 .SH SEE ALSO
 .BR getdents (2),
 .BR readdir (3)