diff --git a/packages/protocol/contracts/L1/TaikoEvents.sol b/packages/protocol/contracts/L1/TaikoEvents.sol
index 4259ae8361..5801111a4c 100644
--- a/packages/protocol/contracts/L1/TaikoEvents.sol
+++ b/packages/protocol/contracts/L1/TaikoEvents.sol
@@ -11,6 +11,12 @@ import "./TaikoData.sol";
 /// L1 libraries.
 /// @custom:security-contact security@taiko.xyz
 abstract contract TaikoEvents {
+    /// @dev Emitted when token is credited back to a user's bond balance.
+    event BondCredited(address indexed user, uint256 amount);
+
+    /// @dev Emitted when token is debited from a user's bond balance.
+    event BondDebited(address indexed user, uint256 amount);
+
     /// @dev Emitted when a block is proposed.
     /// @param blockId The ID of the proposed block.
     /// @param assignedProver The block's assigned prover.