diff --git a/levels/chapter_01.json b/levels/chapter_01.json
index 4e6c18a..81c6a2d 100644
--- a/levels/chapter_01.json
+++ b/levels/chapter_01.json
@@ -5,7 +5,14 @@
 			"id": "output",
 			"name": "Zero",
 			"description": "learn how to output data",
-			"init_board": "\n o \n\n I\n\n",
+			"init_board": {
+				"comments": [
+					{ "text": "Welcome :3", "x": 3, "y": 0 },
+					{ "text": "< This is a marble,\n  it will move down when you start the machine", "x": 3, "y": 2 },
+					{ "text": "< This is an input/output silo\n  when a marble enters it, it disappears\n  and the value it held is added to the level output", "x": 3, "y": 5 }
+				],
+				"grid": "\n\n  o  \n\n\n  I\n\n\n"
+			},
 			"stages": [{
 				"input": [],
 				"output": [0]
diff --git a/src/board.rs b/src/board.rs
index 7cfe928..0017248 100644
--- a/src/board.rs
+++ b/src/board.rs
@@ -1,15 +1,24 @@
+use raylib::{
+	color::Color,
+	drawing::{RaylibDraw, RaylibDrawHandle},
+	math::Vector2,
+};
 use serde::{Deserialize, Serialize};
 
-use crate::marble_engine::{
-	grid::{Grid, ResizeDeltas},
-	pos::Pos,
-	tile::Tile,
+use crate::{
+	marble_engine::{
+		grid::{Grid, ResizeDeltas},
+		pos::Pos,
+		tile::Tile,
+	},
+	theme::TILE_TEXTURE_SIZE,
 };
 
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
 pub struct Comment {
 	text: String,
-	pos: Pos,
+	x: i32,
+	y: i32,
 }
 
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
@@ -62,9 +71,33 @@ impl Board {
 		}
 	}
 
+	pub fn draw_comments(&self, d: &mut RaylibDrawHandle, offset: Vector2, scale: f32) {
+		let tile_size = (TILE_TEXTURE_SIZE * scale) as i32;
+		let font_size = 10 * (scale as i32).max(1);
+		let line_space = 12 * (scale as i32).max(1);
+
+		for comment in &self.comments {
+			let x = comment.x * tile_size + offset.x as i32;
+			let y = comment.y * tile_size + offset.y as i32;
+			for (i, line) in comment.text.lines().enumerate() {
+				let y = y + line_space * i as i32;
+				d.draw_text(&line, x, y, font_size, Color::ORANGE);
+			}
+		}
+	}
+
 	pub fn get_rect(&self, pos: Pos, width: usize, height: usize) -> Self {
-		// TODO filter for comments in the area
-		let comments = self.comments.clone();
+		let comments = self
+			.comments
+			.iter()
+			.filter(|c| c.in_area(pos, width, height))
+			.map(|c| {
+				let mut c = c.clone();
+				c.x -= pos.x as i32;
+				c.y -= pos.y as i32;
+				c
+			})
+			.collect();
 		Self {
 			grid: self.grid.get_rect(pos, width, height),
 			comments,
@@ -72,19 +105,36 @@ impl Board {
 	}
 
 	pub fn paste_board(&mut self, pos: Pos, board: &Board) {
-		// TODO remove overlapping comments
 		self.grid.paste_grid(pos, &board.grid);
-		self.comments.extend_from_slice(&board.comments);
+		for c in &board.comments {
+			let mut comment = c.clone();
+			comment.x += pos.x as i32;
+			comment.y += pos.y as i32;
+			self.add_comment(comment);
+		}
+	}
+
+	pub fn add_comment(&mut self, comment: Comment) {
+		if self.comments.iter().any(|c| c == &comment) {
+			return;
+		}
+		self.comments.push(comment);
 	}
 
 	pub fn grow(&mut self, deltas: &ResizeDeltas) {
 		self.grid.grow(deltas);
-		// TODO adjust comments
+		for c in &mut self.comments {
+			c.x += deltas.x_neg as i32;
+			c.y += deltas.y_neg as i32;
+		}
 	}
 
 	pub fn shrink(&mut self, deltas: &ResizeDeltas) {
 		self.grid.shrink(deltas);
-		// TODO adjust comments
+		for c in &mut self.comments {
+			c.x -= deltas.x_neg as i32;
+			c.y -= deltas.y_neg as i32;
+		}
 	}
 
 	pub fn from_user_str(source: &str) -> Self {
@@ -102,3 +152,12 @@ impl Board {
 		self.grid.height()
 	}
 }
+
+impl Comment {
+	fn in_area(&self, pos: Pos, width: usize, height: usize) -> bool {
+		self.x >= pos.x as i32
+			&& self.y >= pos.y as i32
+			&& self.x < pos.x as i32 + width as i32
+			&& self.y < pos.y as i32 + height as i32
+	}
+}
diff --git a/src/editor.rs b/src/editor.rs
index 21d7352..003d6b1 100644
--- a/src/editor.rs
+++ b/src/editor.rs
@@ -146,7 +146,7 @@ impl Editor {
 			machine,
 			sim_state: SimState::Editing,
 			view_offset: Vector2::zero(),
-			zoom: 1.,
+			zoom: 2.,
 			active_tool: Tool::None,
 			output_as_text,
 			input_as_text,
@@ -553,7 +553,7 @@ impl Editor {
 						self.pasting_board = Some(b);
 					}
 				} else if rl.is_key_pressed(KeyboardKey::KEY_Z) {
-					self.undo()
+					self.undo();
 				} else if rl.is_key_pressed(KeyboardKey::KEY_Y) {
 					self.redo();
 				}
@@ -584,6 +584,10 @@ impl Editor {
 					.draw_marble_values(d, textures, self.view_offset, self.zoom);
 			}
 		}
+		if self.draw_overlay {
+			self.source_board
+				.draw_comments(d, self.view_offset, self.zoom);
+		}
 	}
 
 	pub fn draw(&mut self, d: &mut RaylibDrawHandle, textures: &Textures) {
diff --git a/src/marble_engine.rs b/src/marble_engine.rs
index 89aad50..e18c13f 100644
--- a/src/marble_engine.rs
+++ b/src/marble_engine.rs
@@ -529,6 +529,10 @@ impl Machine {
 		}
 		#[cfg(debug_assertions)]
 		{
+			self.debug_subticks.push(DebugSubTick {
+				grid: self.grid.clone(),
+				pos: None,
+			});
 			self.subtick_index = self.debug_subticks.len() - 1;
 		}
 	}