diff --git a/etc/xo/sdlc/subsystem-list b/etc/xo/sdlc/subsystem-list
index 7a03223..624063f 100644
--- a/etc/xo/sdlc/subsystem-list
+++ b/etc/xo/sdlc/subsystem-list
@@ -21,6 +21,8 @@ xo-procedure2
 xo-numeric
 xo-tokenizer2
 xo-expression2
+xo-reader2
+xo-interpreter2
 xo-allocutil
 xo-alloc
 xo-ratio