diff --git a/src/main/resources/lang/architectstools/en_US.lang b/src/main/resources/lang/architectstools/en_US.lang
index ce4ca07..e906ee4 100644
--- a/src/main/resources/lang/architectstools/en_US.lang
+++ b/src/main/resources/lang/architectstools/en_US.lang
@@ -56,6 +56,7 @@ material.architectstools.paper.name = Paper
 material.architectstools.iron.name = Iron
 material.architectstools.gold.name = Gold
 material.architectstools.steel.name = Steel
+material.architectstools.obsidian.name = Obsidian
 
 # Parts
 part_type.architectstools.head.name = Head