diff --git a/Items.md b/Items.md
index 5be7858..de2af01 100644
--- a/Items.md
+++ b/Items.md
@@ -3,4 +3,4 @@
 | - | - |
 | Biomass | `0x0001` |
 | Iron | undefined |
-| Copper | undefined |
\ No newline at end of file
+| Copper | `0x0004` |
\ No newline at end of file