diff --git a/src/falling_sand/mod.rs b/src/falling_sand/mod.rs
index c09d31d..2d83d59 100644
--- a/src/falling_sand/mod.rs
+++ b/src/falling_sand/mod.rs
@@ -1,5 +1,5 @@
 mod element;
-mod rules;
+pub mod rules;
 mod systems;
 
 use bevy::{
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..f831731
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,2 @@
+pub mod falling_sand;
+pub mod util;
diff --git a/src/main.rs b/src/main.rs
index 03c8da7..4c216a1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,11 +1,9 @@
-mod falling_sand;
-mod util;
-
 use bevy::{
     diagnostic::{FrameTimeDiagnosticsPlugin, LogDiagnosticsPlugin},
     prelude::*,
     window::PresentMode,
 };
+use haranae_rs::falling_sand;
 
 fn main() {
     let window_plugin = WindowPlugin {