diff --git a/src/client/graphics/layers/EventsDisplay.ts b/src/client/graphics/layers/EventsDisplay.ts
index 287375da9..ac4d505b0 100644
--- a/src/client/graphics/layers/EventsDisplay.ts
+++ b/src/client/graphics/layers/EventsDisplay.ts
@@ -261,8 +261,13 @@ export class EventsDisplay extends LitElement implements Layer {
     const traitor = this.game.playerBySmallID(update.traitorID) as PlayerView;
 
     if (!betrayed.isTraitor() && traitor === myPlayer) {
+      const malusPercent = Math.round(
+        (1 - this.game.config().traitorDefenseDebuff()) * 100,
+      );
       this.addEvent({
-        description: `You broke your alliance with ${betrayed.name()}, making you a TRAITOR`,
+        description:
+          `You broke your alliance with ${betrayed.name()}, making you a TRAITOR ` +
+          `(${malusPercent}% defense debuff)`,
         type: MessageType.ERROR,
         highlight: true,
         createdAt: this.game.ticks(),