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Description of problem:
Important point is missing in documentation.

When SELinux packages are not installed during basic installation but afterwards are required, one usually follows the following documentation: http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6-Beta/html/Security-Enhanced_Linux/sect-Security-Enhanced_Linux-Working_with_SELinux-Enabling_and_Disabling_SELinux.html#sect-Security-Enhanced_Linux-Enabling_and_Disabling_SELinux-Enabling_SELinux

But in Topic 5.4.1. on mandatory point is missing.
To make sure SELinux is initalized during system startup one has to run `dracut` to put SELinux awareness into the initramfs

Failing to-do so will cause SELinux not to start during system startup.
So I think that's a mandatory point which should be put into the documentation

Version-Release number of selected component (if applicable):
RHEL 6.x

How reproducible:
Install basic OS (without SELinux) and follow the instruction on http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6-Beta/html/Security-Enhanced_Linux/sect-Security-Enhanced_Linux-Working_with_SELinux-Enabling_and_Disabling_SELinux.html#sect-Security-Enhanced_Linux-Enabling_and_Disabling_SELinux-Enabling_SELinux to enable SELinux

Steps to Reproduce:
1. N/A
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Actual results:
N/A


Expected results:
N/A

Additional info:
N/A

An admonition added to:

Red_Hat_Enterprise_Linux-Security-Enhanced_Linux-6-en-US-3-0.2

http://documentation-devel.engineering.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/Security-Enhanced_Linux/sect-Security-Enhanced_Linux-Working_with_SELinux-Enabling_and_Disabling_SELinux.html#sect-Security-Enhanced_Linux-Enabling_and_Disabling_SELinux-Enabling_SELinux