diff --git a/Chapter_04/4-14_pep8.py b/Chapter_04/4-14_pep8.py
new file mode 100644
index 0000000..22e8630
--- /dev/null
+++ b/Chapter_04/4-14_pep8.py
@@ -0,0 +1,3 @@
+# Exercise 4-14 PEP 8
+# Learning Objective: Get familiar with https://python.org/dv/peps/pep-0008
+# No coding necessary for this exercise 
\ No newline at end of file
diff --git a/Chapter_04/4-15_codeReview.py b/Chapter_04/4-15_codeReview.py
new file mode 100644
index 0000000..a0bc404
--- /dev/null
+++ b/Chapter_04/4-15_codeReview.py
@@ -0,0 +1,11 @@
+# Exercise 4-15 Code Review 
+# Learning Objective: Modify 3 programs to comply with PEP 8. 
+ 
+'''
+Modified Programs: 
+
+4-1
+4-2
+4-3
+
+'''
\ No newline at end of file
diff --git a/Chapter_04/4-1_pizzas.py b/Chapter_04/4-1_pizzas.py
index 868fb61..599d81e 100644
--- a/Chapter_04/4-1_pizzas.py
+++ b/Chapter_04/4-1_pizzas.py
@@ -4,6 +4,6 @@
 favoritePizzas = ['Meat lovers', 'White with Spinach and Feta', 'Pepperoni']
 
 for pizza in favoritePizzas:
-	print(f"I like {pizza} pizza. \n")
+    print(f"I like {pizza} pizza. \n")
 
 print("I really love pizza!")
\ No newline at end of file
diff --git a/Chapter_04/4-2_animals.py b/Chapter_04/4-2_animals.py
index e68edec..04b1aa0 100644
--- a/Chapter_04/4-2_animals.py
+++ b/Chapter_04/4-2_animals.py
@@ -2,15 +2,11 @@
 # Learning Objective: Same as 4-1, utilize for loop. 
 
 animals = ['dog', 'cat', 'ferret']
-
 '''
 for animal in animals: 
 	print(animal)
 '''
-
 #modified: 
-
 for animal in animals: 
-	print(f"A {animal} would make a great pet. \n")
-
+    print(f"A {animal} would make a great pet. \n")
 print("These animals all have 4 legs and make great pets!")
\ No newline at end of file
diff --git a/Chapter_04/4-3_countingToTwenty.py b/Chapter_04/4-3_countingToTwenty.py
index 3d9bcaf..3c2146d 100644
--- a/Chapter_04/4-3_countingToTwenty.py
+++ b/Chapter_04/4-3_countingToTwenty.py
@@ -2,5 +2,5 @@
 # Learning Objective: Use for loop and range method. 
 
 for number in range(1, 21):
-	print(number)
+    print(number)