diff --git a/INotifiableRewardReceiver.sol b/INotifiableRewardReceiver.sol
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+// SPDX-License-Identifier: AGPL-3.0-only
+pragma solidity ^0.8.23;
+
+/// @title INotifiableRewardReceiver
+/// @author [ScopeLift](https://scopelift.co)
+/// @notice The communication interface between contracts that distribute rewards and the
+/// GovernanceStaker contract. In particular, said contracts only need to know the staker
+/// implements the specified method in order to forward payouts to the staker contract. The
+/// GovernanceStaker contract receives the rewards and abstracts the distribution mechanics.
+interface INotifiableRewardReceiver {
+  /// @notice Method called to notify a reward receiver it has received a reward.
+  /// @param _amount The amount of reward.
+  function notifyRewardAmount(uint256 _amount) external;
+}