obtaining src

[Will Senn]

Hi I'm following Chapter 32 - Obtaining the Sources and it says I ought 
to get 25 files, including extsrc.tar.gz, but over in 
ftp.netbsd.org/pub/NetBSD/NetBSD-release-10/tar_files/src, there are 
only 24 and no extsrc.tar.gz... should I be concerned?

- will