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diff --git a/manual/install.texi b/manual/install.texi
index 99397c2ee0..d39d2daacd 100644
--- a/manual/install.texi
+++ b/manual/install.texi
@@ -566,6 +566,8 @@ patches, although we try to avoid this.
 
 If you are installing @theglibc{} on @gnulinuxsystems{}, you need to have
 the header files from a 3.2 or newer kernel around for reference.
+(For the ia64 architecture, you need version 3.2.18 or newer because this
+is the first version with support for the @code{accept4} system call.)
 These headers must be installed using @samp{make headers_install}; the
 headers present in the kernel source directory are not suitable for
 direct use by @theglibc{}.  You do not need to use that kernel, just have