diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6a3417b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/out/
diff --git a/structure.pu b/structure.pu
new file mode 100644
index 0000000..4e6843f
--- /dev/null
+++ b/structure.pu
@@ -0,0 +1,94 @@
+@startuml Boids
+hide empty members
+
+PhysicsObject <|- Boid
+Drawable <|.. Boid
+ChunkManager o- PhysicsObject
+Boid -- ChunkManager: register, get_objects >
+Display - DrawableCollection: draws >
+DrawableCollection o-- Drawable
+DrawableCollection <|.. Main
+Main -- PhysicsObject: simulate >
+Main o-- Boid
+JFrame <|- Display
+
+class Boid {
+  - int group
+  -- constructor --
+  + Boid(int width, int height, int group)
+  -- methods --
+  + draw(Graphics g): void
+  + simulate(int group): void
+}
+
+class ChunkManager {
+  - {static} ArrayList<ArrayList<PhysicsObject>> chunks
+  - {static} int width
+  - {static} int height
+  - {static} int chunks_x
+  - {static} int chunks_y
+  -- initializers --
+  + {static} init(int width, int height, int chunks_x, int chunks_y):
+  + {static} clear(): void
+  -- methods --
+  - {static} to_chunk_coordinates(int x, int y): int
+  - {static} wrap(int index, int max): int
+  + {static} register(PhysicsObject obj): void
+  + {static} get_objects(int x, int y): ArrayList<PhysicsObject>
+}
+
+class Display {
+  - int width
+  - int height
+  - DrawableCollection dc
+  -- constructor --
+  + Display(int width, int height, DrawableCollection dc)
+  -- methods --
+  + paint(Graphics g): void
+}
+
+class Drawable << interface >> {
+  + draw(Graphics g): void
+}
+
+class DrawableCollection <<interface>> {
+  + get_drawables(): Drawable[]
+}
+
+class Main <<Program Entry>> {
+  - {static} final int WIDTH
+  - {static} final int HEIGHT
+  - {static} final int BOID_COUNT
+  - {static} final int CHUNKS_X
+  - {static} final int CHUNKS_Y
+  - {static} final int FRAME_STEP
+  - {static} final int MAX_SPEED
+  ..
+  - Boid[] boids
+  - Display d
+  -- constructor --
+  + Main()
+  -- methods --
+  + {static} main(String[] args): void
+  + run(): void
+  + get_drawables(): Drawable[]
+}
+
+class PhysicsObject{
+  + {static} int width
+  + {static} int height
+  + {static} float max_speed
+  ..
+  + float x
+  + float y
+  + float v_x
+  + float v_y
+  -- constructor --
+  + PhysicsObject(int x, int y, int v_x, int v_y)
+  -- methods --
+  - clamp(float f, float min, float max): float
+  + simulate(): void
+  + apply_force(float x, float y, float factor): void
+  + get_sqr_distance(PhysicsObject obj): double
+}
+@enduml