diff --git a/src/game/morpion.hpp b/src/game/morpion.hpp
index fa0a603bb0ca9aa9d827110f554ae3db998ee22b..5cc78ba314694e00d57f95dea2f5d715909274be 100644
--- a/src/game/morpion.hpp
+++ b/src/game/morpion.hpp
@@ -11,11 +11,11 @@ namespace game
 {
 	struct morpion_state
 	{
-		uint16_t cross_bitboard = 0;
-		uint16_t circle_bitboard = 0;
-		uint8_t total_moves = 0;
-		bool first_player_win = false;
-		bool second_player_win = false;
+		uint16_t cross_bitboard = 0; //bitboard with the played moves of the cross
+		uint16_t circle_bitboard = 0; //bitboard with the played moves of the circle
+		uint8_t total_moves = 0; //Total played moves (<= 9)
+		bool first_player_win = false; //First player is always the cross
+		bool second_player_win = false; //Second player is always the circle
 	};
 	
 	class morpion : public game<morpion_state>
@@ -24,31 +24,31 @@ namespace game
 			morpion();
 			morpion(const morpion& mor) = default;
 			morpion& operator=(const morpion& mor) = default;
-			bool end_of_game() const;
+			bool end_of_game() const; //Is the game ended? (draw or won)
 			int value(std::uint8_t player) const; //Returns if the player win, loose or nothing
 			bool won(std::uint8_t player) const;
 			bool lost(std::uint8_t player) const;
 			bool draw(std::uint8_t player) const;
-			uint8_t current_player() const;
-			std::uint16_t number_of_moves() const;
-			void play(std::uint16_t m);
+			uint8_t current_player() const; //The player that has to play next (at the beginning, the first player)
+			std::uint16_t number_of_moves() const; //Moves played until now
+			void play(std::uint16_t m); //Play a move (updates the state)
 			void undo(std::uint16_t m) {}
-			std::string player_to_string(std::uint8_t player) const;
-			std::string move_to_string(std::uint16_t m) const;
-			std::string to_string() const;
+			std::string player_to_string(std::uint8_t player) const; //String representation of a player
+			std::string move_to_string(std::uint16_t m) const; //String representation of a move (for example, A1)
+			std::string to_string() const; //String representation of the entire game
 			void playout(std::mt19937& engine, int max_depth = -1);
 			std::set<int> to_input_vector() const;
 			void from_input_vector(const std::set<int>& input);
-			morpion_state get_state();
-			void set_state(const morpion_state& state);
+			morpion_state get_state(); //Return the state
+			void set_state(const morpion_state& state); //Replace the current state with the one passed as a parameter
 			std::shared_ptr<game<morpion_state>> do_copy() const;
 			std::uint64_t hash(std::uint16_t m) const;
 			std::uint64_t hash() const;
 			
 		private:
-			inline void update_win();
-			inline bool has_won(uint16_t bitboard);
-			inline bool get(uint16_t bitboard, uint8_t i, uint8_t j) const;
+			inline void update_win(); //Check if someone won and update the state
+			inline bool has_won(uint16_t bitboard); //Check if the player whose bitboard was passed as a param has won
+			inline bool get(uint16_t bitboard, uint8_t i, uint8_t j) const; //Get a case of the board
 
 			const uint8_t CROSS = 1;
 			const uint8_t CIRCLE = 0;