I just installed Fedora 20ß. I have a swap partition, but I forgot to tell the installer that I want to use it. Fedora 20 booted without the swap, so I ran:
swapon -L SWAP-sda2
to get it started.
I want to have it used automatically every time I boot the system. The old way it to put a line into fstab; the new way is to do some stuff with systemd files.
Please just tell me how to do it. Eg., link this file here, or create a file with exactly these contents, or edit such and such a file with these new contents, or run these commands, etc.