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-              v4
+              v5
 == Selecting Kernel Version ==
 Normally, standard templates provide an appropriate definition of the kernel number and variant (smp, hugemem...) according to hardware present (as declared in templates). If you want to override this default (used in particular to configure Grub), you can use the following variables :
+Normally, standard templates provide an appropriate definition of the kernel number and variant (smp, hugemem...) according to hardware present (as declared in templates). If you want to override this default, you can use the following variables :
  * `KERNEL_VERSION_NUM` : this must contain the kernel version, as it is in the RPM name, without the architecture.
  * `KERNEL_VARIANT` : `smp`, `hugemem`, `largesmp`... or nothing (empty string) for non smp kernel.
+Proper definition of these variables is important. They are used both to select RPMs to install for kernel and kernel modules and to configure Grub.
+''Note : only one version of RPMs for kernel and kernel module are present at anytime in the configuration. Be cautious when changing one of these variables on an already installed machine as it will uninstall previously used version. This will change in the future when SPMA will be able to keep the previously installed version, even if no longer part of the configuration. Grub cannot be configured to use a kernel version other than the one present in the node profile.''
 == Selecting Kernel Architecture ==