diff --git a/chapter3/recursion.py b/chapter3/recursion.py
new file mode 100644
index 0000000..af815b3
--- /dev/null
+++ b/chapter3/recursion.py
@@ -0,0 +1,7 @@
+def factorial(x):
+    if x == 1:  # This is the base case
+        return 1
+    return x * factorial(x - 1)  # This is the recursive case
+
+
+print(factorial(4))