diff --git a/README.md b/README.md
new file mode 100644
index 0000000..9c6ac77
--- /dev/null
+++ b/README.md
@@ -0,0 +1,28 @@
+# Symbol Strike
+
+
+## Rules
+
+This game is played in two rounds, starting with an empty eleven-space board. Red always goes first.
+
+On Red's board (i.e, duing the first round), Red's job is to maximize the value of the expression; Blue's job is to minimize it.
+Players take turns placing the fourteen symbols `0123456789+-×÷` on the board, with the maximizing player taking the first move.
+
+A board's syntax must always be valid. Namely, the following rules are enforced:
+ - Each symbol may only be used once
+ - The binary operators `+-×÷` may not be next to one another, and may not be at the end slots.
+ - The unary operator `-` (negative) must have a number as an argument. Therefore, it cannot be left of an operator (like `-×`), and it may not be in the rightmost slot.
+ - `0` may not follow `÷`. This prevents most cases of zero-division, but isn't perfect. `÷-0` will break the game, and `÷0_+` is forbidden despite being valid syntax once the empty slot is filled (for example, with `÷03+`). This is done to simplyify game logic, and might be improved later.
+
+
+## Building & Running
+
+As always, run this project with `cargo run`. The app takes one argument by default: the name of the blue player. This can be any of the following:
+ - `human`: Play against a human
+ - `random`: Play against a random agent (very easy)
+ - `minimax`: Play against a simple extremum-chasing agent (easy)
+ - `diffuse`: Play against a slightly more intellegent extremum chaser (medium)
+
+For example, `cargo run -- random` will play a game against a random player.
+
+Additional options are available, see `cargo run -- --help`.
\ No newline at end of file
diff --git a/src/cli.rs b/src/cli.rs
index 6bfa0ba..4fd51cd 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -6,24 +6,39 @@ use crate::{
 };
 
 #[derive(Parser, Debug)]
-#[command(version, about)]
+#[command(about)]
 pub struct Cli {
-	pub red: AgentSelector,
+	/// The agent that controls the Blue (opponent) player
 	pub blue: AgentSelector,
 
+	/// The agent that controls the Red (home) player
+	#[arg(long, default_value = "human")]
+	pub red: AgentSelector,
+
+	/// If this is greater than one, repeat the game this many times and print a summary.
+	/// Best used with --silent.
 	#[arg(long, short, default_value = "0")]
 	pub repeat: usize,
 
+	/// If this is given, do not print boards.
+	/// Good for bulk runs with --repeat, bad for human players.
 	#[arg(long, short, default_value = "false")]
 	pub silent: bool,
 }
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, ValueEnum)]
 pub enum AgentSelector {
-	Random,
-	Diffuse,
-	Minimax,
+	/// A human agent. Asks for input.
 	Human,
+
+	/// A random agent (very easy)
+	Random,
+
+	/// A simple extremum-chaser (easy)
+	Minimax,
+
+	/// A smarter extremum-chaser (medium)
+	Diffuse,
 }
 
 impl AgentSelector {
diff --git a/src/main.rs b/src/main.rs
index d9b82a5..cf66339 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -59,11 +59,18 @@ fn play(
 	let mut is_first_turn = true;
 	let mut is_maxi_turn = true;
 
+	let board_label = format!(
+		"{}{:6}{}",
+		color::Fg(color::LightBlack),
+		maxi.player().to_string(),
+		color::Fg(color::Reset)
+	);
+
 	while !board.is_done() {
 		// Print board
 		println!(
 			"\r{}{}{}{}",
-			" ".repeat(6),
+			board_label,
 			if is_first_turn { '╓' } else { '║' },
 			board.prettyprint()?,
 			if is_first_turn { '╖' } else { '║' },
@@ -99,8 +106,8 @@ fn play(
 		is_maxi_turn = !is_maxi_turn;
 	}
 
-	println!("\r{}║{}║", " ".repeat(6), board.prettyprint()?);
-	println!("\r{}╙{}╜", " ".repeat(6), " ".repeat(board.size()));
+	println!("\r{}║{}║", board_label, board.prettyprint()?);
+	println!("\r{}╙{}╜", board_label, " ".repeat(board.size()));
 	Ok(board)
 }