diff --git a/TODO.txt b/TODO.txt
index 2a04033..6918a91 100644
--- a/TODO.txt
+++ b/TODO.txt
@@ -35,6 +35,9 @@ materials		No		Alloys
 							Bronze
 							Brass
 							Alnico
+materials		No		Metal from slag
+							-> generate iron nuggets in furnace
+							-> random nuggets in alloy furnace
 -------------------------------------------------------------------------------------------------------
 materials.ores	No		Rock salt
 materials.ores	No		Tin