diff --git a/src/trexio/NEED b/src/trexio/NEED
new file mode 100644
index 00000000..625463a2
--- /dev/null
+++ b/src/trexio/NEED
@@ -0,0 +1,8 @@
+ezfio_files
+determinants
+mo_one_e_ints
+mo_two_e_ints
+ao_two_e_ints
+ao_one_e_ints
+two_body_rdm
+hartree_fock