diff --git a/yahtzee.py b/yahtzee.py
index 69b0e97..271cf08 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 of Yahtzee.
+        Creates a score of zero, stores the list of goals, and sets up five dice.
+        """
         self.score = 0
         self.goals = goals
         self.dice = [Die() for num in range(5)]
 
     def play(self):
+        """Play an entire game.
+        Greets the player, resets the score and goals, and continues playing rounds
+        until all goals have been used. Prints the final score at the end.
+        """
         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 a single round of Yahtzee.
+        Rolls all dice, lets the player choose a goal or re-roll, and updates the score.
+        """
         print("=" * 80)
         self.rolls_left = 3
         for die in self.dice:
@@ -29,10 +39,17 @@ class Yahtzee:
         self.score += goal.score(self.dice)
 
     def show_status(self):
+        """Display the current game status.
+        Shows the current score, number of rolls left, and the faces of all 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):
+        """Prompt the player to choose a goal or re-roll.
+        Builds a list of unused goals, displays them, and processes the player's choice.
+        If the player chooses to re-roll, performs a re-roll and re-prompts for a goal.
+        """
         options = []
         unused_goals = self.get_unused_goals()
         for goal in unused_goals:
@@ -49,6 +66,9 @@ class Yahtzee:
             return unused_goals[choice]
 
     def get_choice(self, options):
+         """Display available options and get the player's choice.
+        Validates user input and returns the chosen option as an integer index.
+        """
         print("What would you like to do?")
         for i, option in enumerate(options):
             print(f"{i}. {option}")
@@ -59,6 +79,9 @@ class Yahtzee:
         return int(choice)
 
     def option_choice_is_valid(self, choice, options):
+        """Check whether the player's input is a valid choice.
+        Ensures the input is a number and within the range of available options.
+        """
         if not choice.isdigit():
             return False
         if int(choice) < 0:
@@ -68,9 +91,11 @@ class Yahtzee:
         return True
 
     def count_unused_goals(self):
+        """Return the number of unused goals left in the game."""
         return len(self.get_unused_goals())
 
     def get_unused_goals(self):
+         """Return a list of goals that have not yet been used."""
         unused_goals = []
         for goal in self.goals:
             if not goal.used:
@@ -78,6 +103,10 @@ class Yahtzee:
         return unused_goals
 
     def reroll(self):
+         """Re-roll selected dice.
+        Decreases the number of rolls left, asks the player which dice to re-roll,
+        and rolls the chosen dice again.
+        """
         self.rolls_left -= 1
         choices = self.get_reroll_choices()
         dice_to_reroll = self.get_dice_to_reroll(choices)
@@ -85,6 +114,9 @@ class Yahtzee:
             die.roll()
 
     def get_dice_to_reroll(self, choice_ints):
+         """Identify which dice to re-roll based on the player's choices.
+        Matches chosen face values with current dice faces and returns a list of dice to roll again.
+        """
         dice_to_reroll = []
         for die in self.dice:
             if die.face in choice_ints:
@@ -93,6 +125,9 @@ class Yahtzee:
         return dice_to_reroll
 
     def get_reroll_choices(self):
+         """Ask the player which dice to re-roll.
+        Prompts for input, validates the choices, and returns them as a list of integers.
+        """
         print("Which dice do you want to re-roll?")
         choices = input("> ")
         while not self.reroll_choices_are_valid(choices):
@@ -102,6 +137,9 @@ class Yahtzee:
         return choice_ints
         
     def reroll_choices_are_valid(self, choices_str):
+         """Validate the player's re-roll choices.
+        Checks that all characters are digits and correspond to actual dice values.
+        """
         if not choices_str.isdigit():
             return False
         choice_ints = [int(digit) for digit in choices_str]