diff --git a/ai.js b/ai.js
index c666e97..af045e2 100644
--- a/ai.js
+++ b/ai.js
@@ -6,6 +6,22 @@ const RABBIT_HUNGER_INCREMENT = 0.05;
 const RABBIT_REPRO_CHANCE = 0.005;
 const RABBIT_REPRO_COOLDOWN = 1000;
 
+// Citizen constants
+const HUNGER_INCREMENT = 0.02;
+const HUNGER_MAX = 100;
+const HUNGER_THRESHOLD = 70;
+const ENERGY_DECREMENT_WORK = 0.01;
+const ENERGY_INCREMENT_REST = 0.1;
+const ENERGY_MAX = 100;
+const ENERGY_THRESHOLD = 30;
+const HEALTH_MAX = 100;
+const HEALTH_THRESHOLD = 50;
+const EDUCATION_MAX = 100;
+const FRUIT_GATHER_RATE = 2;
+const FRUIT_PLANT_COST = 5;
+const FRUIT_TREE_START_AMOUNT = 50;
+const REWARD_DELIVER_WOOD = 5;
+
 /**********************************************************************
  * CITIZEN AI
  **********************************************************************/