diff --git a/chasms/mod.conf b/chasms/mod.conf
index 360589f..554fd11 100644
--- a/chasms/mod.conf
+++ b/chasms/mod.conf
@@ -1,2 +1,3 @@
 name=chasms
-depends=mapgen_helper
\ No newline at end of file
+depends=mapgen_helper
+optional_depends=df_caverns
\ No newline at end of file