Update README.md

trexminer · Jun 9, 2019 · 3645e5f · 3645e5f
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                                     bcd
                                     bitcore
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 ## JSON config file
 
-To start T-Rex with config file `config.txt` type in the console: `t-rex -c config.txt`. Use `config_example` file as a starting point to create your own config.
+To start T-Rex with config file `config.txt` type in the console: `t-rex -c config.txt`. Use `config_example` file as a starting point to create your own config. You can also use environment variables: simply put `%YOUR_ENV_VAR%` anywhere in your config file and it will get automatically substituted with the value of `YOUR_ENV_VAR` variable at run-time.
 
 ## Watchdog