diff --git a/.env.example b/.env.example
index 3a8f217..d15dc4f 100644
--- a/.env.example
+++ b/.env.example
@@ -1,8 +1,16 @@
-ETH_CLIENT_ADDRESS=https://sepolia.infura.io/v3/<key>  # RPC URL for accessing testnet via HTTP.
-ETH_TESTNET_KEY=<YOUR_TESTNET_PRIVATE_KEY_HERE>        # Privatekey of testnet where you have sepolia ETH that would be staked into RLN contract
-RLN_RELAY_CRED_PASSWORD="my_secure_keystore_password"  # Password you would like to use to protect your RLN membership
+# RPC URL for accessing testnet via HTTP.
+# e.g. https://sepolia.infura.io/v3/123aa110320f4aec179150fba1e1b1b1
+ETH_CLIENT_ADDRESS=https://sepolia.infura.io/v3/<key>
 
-# Advanced
+# Private key of testnet where you have sepolia ETH that would be staked into RLN contract.
+# Note: make sure you don't use the '0x' prefix.
+#       e.g. 0116196e9a8abed42dd1a22eb63fa2a5a17b0c27d716b87ded2c54f1bf192a0b
+ETH_TESTNET_KEY=<YOUR_TESTNET_PRIVATE_KEY_HERE>
+
+# Password you would like to use to protect your RLN membership.
+RLN_RELAY_CRED_PASSWORD="my_secure_keystore_password"
+
+# Advanced. Can be left empty in normal use cases.
 NWAKU_IMAGE=
 NODEKEY=
 DOMAIN=