diff --git a/infrastructure/road.odin b/infrastructure/road.odin
index 2c24fc3..c0a18b2 100644
--- a/infrastructure/road.odin
+++ b/infrastructure/road.odin
@@ -1,9 +1,11 @@
 package infrastructure
 
 Road :: struct {
+	// Index to nodes that limit the road
 	nodes: [2]u32,
 }
 
+// Road Initialisation
 road_init :: proc(start: u32, end: u32) -> Road {
 	return {
 		nodes = {start, end}
diff --git a/simulator.odin b/simulator.odin
index 7de753d..e6732b9 100644
--- a/simulator.odin
+++ b/simulator.odin
@@ -6,15 +6,24 @@ import "common"
 import "core:fmt"
 import inf "infrastructure"
 
+// PLAN AREA
+// TODO implement right click 'cancel building functionali'
+// TODO implement deleting of roads
+
 Simulator :: struct {
+	// Stores all nodes
 	nodes: [dynamic]inf.Node,
+	// Stores all roads
 	roads: [dynamic]inf.Road,
+	// Tracks the temporary node location
 	temp_node_index: Maybe(u32),
-	// tracking variables
+	// Tracks whether the user wishes to see node's snapping radius
 	show_details: bool,
+	// Tracks whether after placing a road new one will start being placed
 	auto_continue: bool,
 }
 
+// Constructor
 init :: proc() -> Simulator {
 	return {
 		nodes = nil,
@@ -25,17 +34,20 @@ init :: proc() -> Simulator {
 	}
 }
 
+// Destructor
 deinit :: proc(self: ^Simulator) {
 	self.temp_node_index = nil
 	delete(self.roads)
 	delete(self.nodes)
 }
 
+// Public input function that gets called in graphics library loop
 handle_input :: proc(self: ^Simulator, pos: rl.Vector2) {
 	handle_keyboard_input(self)
 	handle_mouse_input(self, pos)
 }
 
+// General keyboard input event handler
 @(private="file")
 handle_keyboard_input :: proc(self: ^Simulator) {
 	self.show_details = rl.IsKeyDown(.LEFT_ALT)
@@ -48,11 +60,13 @@ handle_keyboard_input :: proc(self: ^Simulator) {
 	}
 }
 
+// Generally mouse event handler
 @(private="file")
 handle_mouse_input :: proc(self: ^Simulator, pos: rl.Vector2) {
 	if (rl.IsMouseButtonReleased(.LEFT)) do left_click_event(self, pos)
 }
 
+// Handles left click functionality
 @(private="file")
 left_click_event :: proc(self: ^Simulator, pos: rl.Vector2) {
 	cur_node_index := get_node_or_new(self, pos)
@@ -68,6 +82,7 @@ left_click_event :: proc(self: ^Simulator, pos: rl.Vector2) {
 	self.temp_node_index = cur_node_index
 }
 
+// Main drawing function
 draw :: proc(self: ^Simulator, pos: rl.Vector2) {
 	rl.ClearBackground(common.BACKGROUND_COLOUR)
 	
@@ -148,6 +163,8 @@ get_intersecting_roads :: proc(self: ^Simulator, start: u32, end: u32) -> []comm
 	return intersections[:]
 }
 
+// Given intersection data, the function splits all existing roads and adds new nodes on intersections
+@(private="file")
 split_roads_by_points :: proc(self: ^Simulator, intersections: []common.Intersection_Data, start: u32, end: u32) {
 	if len(intersections) == 0 {
 		road := inf.road_init(start, end)