Add note about RHEL (etc.) 6
Add note about RHEL (etc.) 6

jawj/passenger,phusion/passenger,openSUSE/passenger,phusion/passenger,pkmiec/passenger,erikogan/passenger,antek-drzewiecki/passenger,antek-drzewiecki/passenger,cgvarela/passenger,kewaunited/passenger,clemensg/passenger,erikogan/passenger,gravitystorm/passenger,clemensg/passenger,cgvarela/passenger,bf4/passenger,clemensg/passenger,gravitystorm/passenger,antek-drzewiecki/passenger,kewaunited/passenger,phusion/passenger,openSUSE/passenger,cgvarela/passenger,kewaunited/passenger,cgvarela/passenger,cgvarela/passenger,openSUSE/passenger,bf4/passenger,pkmiec/passenger,openSUSE/passenger,antek-drzewiecki/passenger,clemensg/passenger,bf4/passenger,clemensg/passenger,cgvarela/passenger,antek-drzewiecki/passenger,gravitystorm/passenger,clemensg/passenger,gravitystorm/passenger,cgvarela/passenger,pkmiec/passenger,openSUSE/passenger,gravitystorm/passenger,phusion/passenger,erikogan/passenger,pkmiec/passenger,phusion/passenger,clemensg/passenger,pkmiec/passenger,pkmiec/passenger,kewaunited/passenger,antek-drzewiecki/passenger,kewaunited/passenger,openSUSE/passenger,kewaunited/passenger,erikogan/passenger,bf4/passenger,jawj/passenger,bf4/passenger,phusion/passenger,bf4/passenger,erikogan/passenger,pkmiec/passenger,phusion/passenger,kewaunited/passenger,jawj/passenger,phusion/passenger,jawj/passenger,jawj/passenger,kewaunited/passenger,erikogan/passenger,bf4/passenger,jawj/passenger,cgvarela/passenger,clemensg/passenger,antek-drzewiecki/passenger,jawj/passenger,gravitystorm/passenger,antek-drzewiecki/passenger