diff --git a/zs.docs/SystemMastery/Production Speed for Buildings.md b/zs.docs/SystemMastery/Production Speed for Buildings.md
index ac29108..5eb3d9c 100644
--- a/zs.docs/SystemMastery/Production Speed for Buildings.md	
+++ b/zs.docs/SystemMastery/Production Speed for Buildings.md	
@@ -11,6 +11,8 @@ availableSystems:
   - "[[Starless Sky]]"
   - "[[Steel Depths]]"
   - "[[Glittering Hope]]"
+  - "[[Ebony Keep]]"
+  - "[[Stronghold Cronus]]"
 productionSpeedForBuildings: 0.09
 ---
 9% production speed. Seems obvious for any tech up strategy.