Update README.md

README.md

@@ -74,7 +74,9 @@ Create a .env file (or just rename the .example.env) containing all the env vari
 4. `PARENTNET_WALLET_PK` : This is the wallet key that will be used for submit subnet data into parent chain. You will need to have credits in it first.
 5. `SLACK_WEBHOOK` : (Optional) If relayer detected forking of your subnet, this is the URL where we will push alerting message to. You are required to set up slack bot and install it in the relevant channel first. For details, see slack doc: https://api.slack.com/messaging/webhooks \n
    Once you are done with the slack setup, find the slack webhook url and put it here. It shall look like `https://hooks.slack.com/services/T00000000/B00000000/XXXXXXXXXXXXXXXXXXXXXXXX` We only need the ones after `https://hooks.slack.com/services/`
-
+6. `SUBNET_ZERO_CONTRACT` : Contract address for the XDC Zero endpoint on the subnet.
+7. `PARENTNET_ZERO_CONTRACT` : Contract address for the XDC Zero endpoint on the parentnet.
+8. `PARENTNET_ZERO_WALLET_PK` : XDC Zero wallet private key for running the zero schedule program.
 ## Getting TypeScript
 
 TypeScript itself is simple to add to any project with `npm`.