Link to ElectrumX env var docs

README.md

@@ -22,6 +22,8 @@ docker run \
 
 If there's an SSL certificate/key (`electrumx.crt`/`electrumx.key`) in the `/data` volume it'll be used. If not, one will be generated for you.
 
+You can view all ElectrumX environment variables here: https://github.com/kyuupichan/electrumx/blob/master/docs/ENVIRONMENT.rst
+
 ### TCP Port
 
 By default only the SSL port is exposed. You can expose the unencrypted TCP port with `-p 50001:50001`, although this is strongly discouraged.