diff --git a/src/casscf_tc_bi/NEED b/src/casscf_tc_bi/NEED
new file mode 100644
index 00000000..b4c958e6
--- /dev/null
+++ b/src/casscf_tc_bi/NEED
@@ -0,0 +1,3 @@
+determinants
+tc_bi_ortho
+fci_tc_bi