diff --git a/zs.docs/SystemMastery/Production Speed for Buildings.md b/zs.docs/SystemMastery/Production Speed for Buildings.md
index 5eb3d9c..a4a6904 100644
--- a/zs.docs/SystemMastery/Production Speed for Buildings.md	
+++ b/zs.docs/SystemMastery/Production Speed for Buildings.md	
@@ -13,6 +13,7 @@ availableSystems:
   - "[[Glittering Hope]]"
   - "[[Ebony Keep]]"
   - "[[Stronghold Cronus]]"
+  - "[[Iotan Tears]]"
 productionSpeedForBuildings: 0.09
 ---
 9% production speed. Seems obvious for any tech up strategy.