[Q] Unlocking the bootloader topic

One year have passed since I bought a Xperia Z, and I want to unlock the bootloader to install Pacman ROM. My question is, if I unlock my bootloader, will I lose the warranty? I am living in Romania, an EU country, and I know that if the phone has any hardware related problems, modified software should not mean anything and the company which produced the phone is obliged to repair it for free. Unfortunately, Sony doesn't specify this anywhere. So, if I unlock the bootloader, my warranty will be void or not? Thanks in advance :)