diff --git a/depends.txt b/depends.txt
deleted file mode 100644
index 7cceef1..0000000
--- a/depends.txt
+++ /dev/null
@@ -1,4 +0,0 @@
-default
-mobs
-ethereal?
-intllib?
diff --git a/description.txt b/description.txt
deleted file mode 100644
index 8c97eaf..0000000
--- a/description.txt
+++ /dev/null
@@ -1 +0,0 @@
-An aggressive shark mob.
diff --git a/mod.conf b/mod.conf
index c165cef..7c2064f 100644
--- a/mod.conf
+++ b/mod.conf
@@ -5,3 +5,5 @@ description = An aggressive shark mob
 author = sapier
 license = CC BY-SA 3.0
 forum = https://forum.minetest.net/viewtopic.php?t=629
+depends = default, mobs
+optional_depends = ethereal, intllib