diff --git a/src/ethereum/rfc003/mod.rs b/src/ethereum/rfc003/mod.rs
index 1588b3b..4213f1e 100644
--- a/src/ethereum/rfc003/mod.rs
+++ b/src/ethereum/rfc003/mod.rs
@@ -9,16 +9,24 @@ pub use ether_htlc::EtherHtlc;
 /// These are the hex-encoded ASCII-codepoints of the word "redeemed", padded to a length of 32 bytes.
 pub const REDEEMED_LOG_MSG: &str =
     "72656465656d6564000000000000000000000000000000000000000000000000";
+
 /// The log message emitted when the HTLC is refunded.
 ///
 /// These are the hex-encoded ASCII-codepoints of the word "refund", padded to a length of 32 bytes.
 pub const REFUNDED_LOG_MSG: &str =
     "726566756e646564000000000000000000000000000000000000000000000000";
-/// The return message emitted when someone attempted to refund the HTLC before the timeout.
+
+/// The returned message when someone attempted to refund the HTLC before the timeout.
 ///
 /// These are the hex-encoded ASCII-codepoints of the word "tooEarly", padded to a length of 32 bytes.
 pub const TOO_EARLY: &str = "746f6f4561726c79000000000000000000000000000000000000000000000000";
-/// The return message emitted when someone attempted to redeem the HTLC with an invalid secret.
+
+/// The returned message when someone attempted to redeem the HTLC with an invalid secret.
 ///
 /// These are the hex-encoded ASCII-codepoints of the word "invalidSecret", padded to a length of 32 bytes.
 pub const INVALID_SECRET: &str = "696e76616c696453656372657400000000000000000000000000000000000000";
+
+/// The log message emitted by an ERC-20 token contract when a transfer is done, as per the ERC-20 EIP.
+///
+/// This is the result of keccak('Transfer(address,address,uint256)')/
+pub const ERC20_TRANSFER: &str = "ddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef";