diff --git a/contracts/governance/IGovernor.sol b/contracts/governance/IGovernor.sol
index a35aa18aba2..67abfdbbae4 100644
--- a/contracts/governance/IGovernor.sol
+++ b/contracts/governance/IGovernor.sol
@@ -8,6 +8,9 @@ import {IERC6372} from "../interfaces/IERC6372.sol";
 
 /**
  * @dev Interface of the {Governor} core.
+ *
+ * NOTE: Event parameters lack the `indexed` keyword for compatibility with GovernorBravo events.
+ * Making event parameters `indexed` affects how events are decoded, potentially breaking existing indexers.
  */
 interface IGovernor is IERC165, IERC6372 {
     enum ProposalState {