diff --git a/src/app.rs b/src/app.rs
new file mode 100644
index 0000000..e69de29
diff --git a/src/main.rs b/src/main.rs
index 99c5e26..e487c7d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,4 +1,6 @@
+mod app;
 mod csv;
+mod ui;
 
 fn main() {
     println!("Hello, world!");
diff --git a/src/ui.rs b/src/ui.rs
new file mode 100644
index 0000000..e69de29