diff --git a/app/data/stacks/mainnet-eth/README.md b/app/data/stacks/mainnet-eth/README.md
index 79a3e788..8f0dc1c4 100644
--- a/app/data/stacks/mainnet-eth/README.md
+++ b/app/data/stacks/mainnet-eth/README.md
@@ -17,7 +17,7 @@ $ laconic-so --stack mainnet-eth build-containers
 ## Create a deployment
 
 ```
-$ laconic-so --stack mainnet-eth deploy init --output mainnet-eth-spec.yml
+$ laconic-so --stack mainnet-eth deploy init --map-ports-to-host any-same --output mainnet-eth-spec.yml
 $ laconic-so deploy create --spec-file mainnet-eth-spec.yml --deployment-dir mainnet-eth-deployment
 ```
 ## Start the stack
@@ -138,4 +138,4 @@ $ sudo du -h mainnet-eth-deployment/data/
 860G    mainnet-eth-deployment/data/mainnet_eth_geth_1_data/geth
 860G    mainnet-eth-deployment/data/mainnet_eth_geth_1_data
 885G    mainnet-eth-deployment/data/
-```
\ No newline at end of file
+```