diff --git a/README.md b/README.md
index b828ae4..aa77b5d 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,7 @@ Currently IndustrialTest supports following games:
     - none
 
 ## Optional dependencies
+- [Rubber Addon for MineClone](https://content.minetest.net/packages/biochemist/mcl_rubber)
 - [Pipeworks](https://content.minetest.net/packages/VanessaE/pipeworks)
 
 ## Contributors