diff --git a/testnets/helder/README.md b/testnets/helder/README.md
index 508745250..d59201996 100644
--- a/testnets/helder/README.md
+++ b/testnets/helder/README.md
@@ -119,6 +119,8 @@ ENGINE_API_URL=""
 JWT_HEX=""
 # Fee recipient
 FEE_RECIPIENT=""
+# The Bolt RPC port. This port must be exposed!
+BOLT_RPC_PORT="8000"
 
 # BLS commitment signing key, i.e. 0x4d129a19df86a0f5345bad4cc6f249ec2a819ccc3386895beb4f7d98b3db6235
 # Some other random keys:
@@ -133,6 +135,10 @@ BOLT_RELAY="http://0xa55c1285d84ba83a5ad26420cd5ad3091e49c55a813eee651cd467db38a
 
 Then, simply run `docker compose up`. This will start the sidecar and the modified mev-boost.
 
+> [!IMPORTANT]  
+> The Bolt RPC port must be exposed to the internet to allow users to send commitment requests to it.
+> The RPC will be registered in an on-chain registry in the next step.
+
 ## Validators
 
 In this section we cover how one should configure their validators and register them in the Bolt on-chain [registry](https://github.com/chainbound/bolt/tree/unstable/bolt-contracts#registry).
diff --git a/testnets/helder/docker-compose.yml b/testnets/helder/docker-compose.yml
index 4141827ed..fb4390c0a 100644
--- a/testnets/helder/docker-compose.yml
+++ b/testnets/helder/docker-compose.yml
@@ -7,7 +7,7 @@ services:
       - "8000:8000"
       - "18551:18551"
     env_file: ./launch.env
-    entrypoint: /bin/sh -c '/bolt-sidecar --port 8000 --beacon-api-url $$BEACON_API_URL --execution-api-url $$EXECUTION_API_URL --engine-api-url $$ENGINE_API_URL --private-key $$SIGNING_KEY --mevboost-url http://bolt-boost:18500 --mevboost-proxy-port 18551 --jwt-hex $$JWT_HEX --fee-recipient $$FEE_RECIPIENT'
+    entrypoint: /bin/sh -c '/bolt-sidecar --port $$BOLT_RPC_PORT --beacon-api-url $$BEACON_API_URL --execution-api-url $$EXECUTION_API_URL --engine-api-url $$ENGINE_API_URL --private-key $$SIGNING_KEY --mevboost-url http://bolt-boost:18500 --mevboost-proxy-port 18551 --jwt-hex $$JWT_HEX --fee-recipient $$FEE_RECIPIENT'
 
   bolt-boost:
     image: ghcr.io/chainbound/bolt-boost:v0.1.1-alpha
diff --git a/testnets/helder/launch.env b/testnets/helder/launch.env
index f0a24bbc9..b78e16b1c 100644
--- a/testnets/helder/launch.env
+++ b/testnets/helder/launch.env
@@ -8,6 +8,8 @@ ENGINE_API_URL=""
 JWT_HEX=""
 # Fee recipient
 FEE_RECIPIENT=""
+# The Bolt RPC port. This port must be exposed!
+BOLT_RPC_PORT="8000"
 
 # BLS commitment signing key, i.e. 0x4d129a19df86a0f5345bad4cc6f249ec2a819ccc3386895beb4f7d98b3db6235
 # Some other random keys: