diff --git a/README.txt b/README.txt
index 678fdb9..fdb437c 100644
--- a/README.txt
+++ b/README.txt
@@ -6,3 +6,8 @@ Implements a simple dungeon crawler on the Minetest Engine.
 Stuff inside is licensed under WTFPL, CC0, and CC BY-SA; see mod directories
 for more info.
 
+Requires a version of Minetest dated >=2013-03-23:
+  https://github.com/minetest/minetest
+And the Common Mods
+  https://github.com/minetest/common
+