If you want permanent cwm (which will automatically replace the stock recover) you will have to flash another kernel.
Lets take as an example Siyah kernel (which will automatically root your phone and grant you permanent cwm)
1) Download the ker...
its paranoidandroid, a custom rom. google it
remember rooting with cf autoroot will trip ur knox counter to 0x1, meaning your warranty will be gone. use towelroot method instead.
you will not lose the warranty if you live in Europe!
Sent from my GT-I9505 Sammy Deluxe S5 Rom "Jello Biafra"
oh thats cool, i do not live in europe but anyway, good to know :)
remmeber the knox flag will be tripped to 0x1 and if you are still under warranty, you will lose it