diff --git a/extra_info_types_none.txt b/extra_info_types_none.txt
new file mode 100644
index 0000000..95cb9f8
--- /dev/null
+++ b/extra_info_types_none.txt
@@ -0,0 +1,3 @@
+# No extra-info variables.
+# Use this file with --extra_info_types_file to train/evaluate with disease history only.
+# Keep this file free of numeric type ids; the loader parses it as an empty list.