diff --git a/zs.docs/SystemMastery/Hero Damage.md b/zs.docs/SystemMastery/Hero Damage.md
index 36a898b..a848483 100644
--- a/zs.docs/SystemMastery/Hero Damage.md	
+++ b/zs.docs/SystemMastery/Hero Damage.md	
@@ -5,6 +5,8 @@ level_2: +3% hero damage
 level_3: +3% hero damage
 level_4: +3% hero damage
 level_5: +5% cooldown on heroes abilities
+availableSystems:
+  - "[[Stronghold Atlas]]"
 heroDamage: 0.12
 heroCooldown: 0.05
 ---