diff --git a/compose/env-sample/lndtn/robosats.env b/compose/env-sample/lndtn/robosats.env
index da9517a..fe7074b 100644
--- a/compose/env-sample/lndtn/robosats.env
+++ b/compose/env-sample/lndtn/robosats.env
@@ -19,6 +19,7 @@ CLN_GRPC_HOST='localhost:9999'
 CLN_GRPC_HOLD_HOST='localhost:9998'
 
 # Bitcoin Core Daemon RPC, used to validate addresses
+# For mainnet the URL port is 8332
 BITCOIND_RPCURL = 'http://127.0.0.1:18332'
 BITCOIND_RPCUSER = 'robosats_testnet_bitcoind'
 BITCOIND_RPCPASSWORD = 'robosats_testnet_bitcoind'
@@ -167,4 +168,4 @@ MINIMUM_TARGET_CONF = 24
 SLASHED_BOND_REWARD_SPLIT = 0.5
 
 # Username for HTLCs escrows
-ESCROW_USERNAME = 'admin'
\ No newline at end of file
+ESCROW_USERNAME = 'admin'