diff --git a/subject_text/tree b/subject_text/tree
index af5deae..9681cf5 100644
--- a/subject_text/tree
+++ b/subject_text/tree
@@ -2,6 +2,7 @@
 ├── Cargo.toml
 └── src
     ├── errors
-    │   └── option.rs
+    │   ├── option.rs
+    │   └── result.rs
     ├── errors.rs
     └── lib.rs