The section "8.6. Preparing for Kernel Development" of the FC5 Release Notes is
not right. If you follow the downloading instructions for kernel source with
yum, you will get the following: 

[root@pedro ~]# yumdownloader --source kernel
/usr/lib/python2.4/site-packages/yum/config.py:447: DeprecationWarning:
setConfigOption() will go away in a future version of Yum.
Please set option values as attributes or using setattr().
  DeprecationWarning)
/usr/lib/python2.4/site-packages/yum/config.py:439: DeprecationWarning:
getConfigOption() will go away in a future version of Yum.
Please access option values as attributes or using getattr().
  DeprecationWarning)
core                                                                 [1/3]
updates                                                              [2/3]
extras                                                               [3/3]
No Match for argument kernel

Also, the line "You can also find the .config file that matches your current
kernel configuration in the /lib/modules/<version>/build/.config file." is not
OK. It does not exists (on x86_64 kernels). 

Best regards.