diff --git a/.env.example b/.env.example
index 1d941b5..851de80 100644
--- a/.env.example
+++ b/.env.example
@@ -6,6 +6,7 @@ APP_PORT=8000
 APP_BASE_URL=http://localhost:8000
 
 # x402 Payment Settings
+# Valid networks: base-sepolia (testnet), base (mainnet)
 NETWORK=base-sepolia
 FACILITATOR_URL=https://x402f1.secondstate.io
 MAX_TIMEOUT_SECONDS=60