diff --git a/config/example.localnode.env b/config/example.localnode.env
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+# Example environment variables for running a local Base node.
+
+# L1 RPC endpoint used by the node.
+L1_RPC_URL=http://localhost:8545
+
+# OP node RPC endpoint (if applicable).
+OP_NODE_RPC_URL=http://localhost:9545
+
+# Execution client name (for example: geth or op-geth).
+CLIENT=geth
+
+# Optional: directory on the host where chain data is stored.
+HOST_DATA_DIR=./geth-data