diff --git a/zs.docs/SystemMastery/Production Speed for Buildings.md b/zs.docs/SystemMastery/Production Speed for Buildings.md
index 2646794..22360a0 100644
--- a/zs.docs/SystemMastery/Production Speed for Buildings.md	
+++ b/zs.docs/SystemMastery/Production Speed for Buildings.md	
@@ -8,6 +8,8 @@ level_5: +5% Production speed for buildings
 availableSystems:
   - "[[Endless Wastes]]"
   - "[[Sullen Dwarf]]"
+  - "[[Starless Sky]]"
+  - "[[Steel Depths]]"
 productionSpeedForBuildings: 0.09
 ---
 9% production speed. Seems obvious for any tech up strategy.