diff --git a/yahtzee.py b/yahtzee.py
index 69b0e97..493ae31 100644
--- a/yahtzee.py
+++ b/yahtzee.py
@@ -5,11 +5,18 @@ class Yahtzee:
     This version of Yahtzee is initialized with a list of goals.
     """
     def __init__(self, goals):
+        """Initialize a new game. Sets the starting score to zero, 
+        strores the list of goals and creates five dice for game.
+        """
         self.score = 0
         self.goals = goals
         self.dice = [Die() for num in range(5)]
 
     def play(self):
+        """Play an entire game. Starts by greeting the user, then plays rounds 
+        until all the goals have been used. When the game is over, tells the player
+        their final score. 
+        """
         print("Welcome to Yachtzee!")
         self.score = 0
         for goal in self.goals:
@@ -19,6 +26,9 @@ class Yahtzee:
         print(f"Your final score was {self.score}")
 
     def play_round(self):
+        """Play one round. Rolls all dice, displays game status,
+        allows player to re roll or choose a goal and updates score. 
+        """
         print("=" * 80)
         self.rolls_left = 3
         for die in self.dice:
@@ -29,10 +39,16 @@ class Yahtzee:
         self.score += goal.score(self.dice)
 
     def show_status(self):
+        """Displays current game status. Shows player's score, 
+        remaining rolls, and current values of all five dice. 
+        """
         dice = ', '.join([str(die) for die in self.dice])
         print(f"Score: {self.score}. Rolls left: {self.rolls_left}. Dice: {dice}.")
 
     def choose_goal(self):
+        """Allow player to choose a goal or re roll dice. Displays
+        available goals and re roll options, then processes player's choice. 
+        """
         options = []
         unused_goals = self.get_unused_goals()
         for goal in unused_goals:
@@ -49,6 +65,9 @@ class Yahtzee:
             return unused_goals[choice]
 
     def get_choice(self, options):
+        """Get choice from player. Displays numbered options and repeatedly
+        asks for input until the player enters a valid choice. 
+        """
         print("What would you like to do?")
         for i, option in enumerate(options):
             print(f"{i}. {option}")
@@ -59,6 +78,8 @@ class Yahtzee:
         return int(choice)
 
     def option_choice_is_valid(self, choice, options):
+        """Check if choice is valid. Ensures choice is a number within range. 
+        """
         if not choice.isdigit():
             return False
         if int(choice) < 0:
@@ -68,9 +89,15 @@ class Yahtzee:
         return True
 
     def count_unused_goals(self):
+        """Count how many goals remain unused. Returns number of goals
+        not yet been scored.  
+        """
         return len(self.get_unused_goals())
 
     def get_unused_goals(self):
+        """Get all unused goals. Returns a list of goals that have not
+        been selected yet. 
+        """
         unused_goals = []
         for goal in self.goals:
             if not goal.used:
@@ -78,6 +105,9 @@ class Yahtzee:
         return unused_goals
 
     def reroll(self):
+        """Re - roll selected dice. Decreases the number of rolls left
+        and rolls only the dice chosen by the player.
+        """
         self.rolls_left -= 1
         choices = self.get_reroll_choices()
         dice_to_reroll = self.get_dice_to_reroll(choices)
@@ -85,6 +115,9 @@ class Yahtzee:
             die.roll()
 
     def get_dice_to_reroll(self, choice_ints):
+        """Determine which dice to re roll. Matches player's selected values
+        to dice and returns the corresponding dice. 
+        """
         dice_to_reroll = []
         for die in self.dice:
             if die.face in choice_ints:
@@ -93,6 +126,9 @@ class Yahtzee:
         return dice_to_reroll
 
     def get_reroll_choices(self):
+        """Gets dice values the player wants to re - roll. Player enter
+        dice values and returns them as a integers. 
+        """
         print("Which dice do you want to re-roll?")
         choices = input("> ")
         while not self.reroll_choices_are_valid(choices):
@@ -102,6 +138,9 @@ class Yahtzee:
         return choice_ints
         
     def reroll_choices_are_valid(self, choices_str):
+        """Check re roll input is valid. Makes sure entered values
+        are nummbers that match dice. 
+        """
         if not choices_str.isdigit():
             return False
         choice_ints = [int(digit) for digit in choices_str]