diff --git a/shared/src/types.ts b/shared/src/types.ts
index 78cb024..a664b05 100644
--- a/shared/src/types.ts
+++ b/shared/src/types.ts
@@ -137,13 +137,15 @@ export interface WorldState {
   tileSize: number;
   obstacles: Position[];
   pointsOfInterest: { type: 'food' | 'rest'; position: Position }[];
-  terrain: number[];       // flat array [y * width + x], terrain type per tile
-  decorations: number[];   // flat array [y * width + x], decoration tile index (-1 = none)
+  terrain: number[];            // flat array [y * width + x], terrain type per tile
+  decorations: number[];        // flat array [y * width + x], decoration tile index (-1 = none)
+  trunkDecorations: number[];   // flat array [y * width + x], trunk tile index (-1 = none)
 }
 
 export interface StateUpdate {
   entities: EntityState[];
   tick: number;
+  gameTime: number; // 0.0-1.0 normalized position in day/night cycle
 }
 
 export interface PlayerJoined {