Where to add "txindex = 1"

[slrslr]

The install readme says: "setup JSON RPC values in your config and add:
txindex = 1

But config.php do not looks to contain any such syntax: something = something. It really have to be on the firs tline in the config.php file?

[BaalMcKloud]

add "txindex=1" to your coin config..