diff --git a/guide/engine/src/types/game-data.ts b/guide/engine/src/types/game-data.ts
index 502e5476..baa9e637 100644
--- a/guide/engine/src/types/game-data.ts
+++ b/guide/engine/src/types/game-data.ts
@@ -275,8 +275,10 @@ export interface Government {
 export interface Era {
   id: string
   name: string
+  display_name: string
   description: string
-  trigger: { type: string }
+  trigger: { type: string; required_techs?: number; pillar?: string }
+  max_event_tier: number
   flavor_text: string
 }