diff --git a/testnet-nitro-node.md b/testnet-nitro-node.md
index 7abeae4..ecb7626 100644
--- a/testnet-nitro-node.md
+++ b/testnet-nitro-node.md
@@ -623,6 +623,16 @@ Perform swaps using a swap channel created with another Nitro node over the mirr
 
 ### Performing swaps
 
+* Ensure that environment variables for asset addresses are set:
+
+  ```bash
+  export GETH_CHAIN_ID="1212"
+
+  # Get asset addresses from assets.json file
+  export ASSET_ADDRESS_1=$(jq -r --arg chainId "$GETH_CHAIN_ID" '.[$chainId][0].contracts.TestToken.address' assets.json)
+  export ASSET_ADDRESS_2=$(jq -r --arg chainId "$GETH_CHAIN_ID" '.[$chainId][0].contracts.TestToken2.address' assets.json)
+  ```
+
 * Get all active swap channels for a specific mirrored ledger channel
 
   * To get mirrored ledger channels: