diff --git a/crates/primitives/src/transaction/signature.rs b/crates/primitives/src/transaction/signature.rs
index 6d051633b5..9df9a29535 100644
--- a/crates/primitives/src/transaction/signature.rs
+++ b/crates/primitives/src/transaction/signature.rs
@@ -7,6 +7,8 @@ use serde::{Deserialize, Serialize};
 
 /// The order of the secp256k1 curve, divided by two. Signatures that should be checked according
 /// to EIP-2 should have an S value less than or equal to this.
+///
+/// `57896044618658097711785492504343953926418782139537452191302581570759080747168`
 const SECP256K1N_HALF: U256 = U256::from_be_bytes([
     0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
     0x5D, 0x57, 0x6E, 0x73, 0x57, 0xA4, 0x50, 0x1D, 0xDF, 0xE9, 0x2F, 0x46, 0x68, 0x1B, 0x20, 0xA0,