diff --git a/README.md b/README.md
index e9f180a..afb7e14 100644
--- a/README.md
+++ b/README.md
@@ -61,8 +61,8 @@ print(f"Derivative of f1: {df1}")
 # > Derivative of f1: 4x - 3
 
 # 4. Get the 2nd derivative: 4
-df1 = f1.nth_derivative(2)
-print(f"2nd Derivative of f1: {df1}")
+ddf1 = f1.nth_derivative(2)
+print(f"2nd Derivative of f1: {ddf1}")
 # > Derivative of f1: 4
 
 # 5. Find roots analytically using the quadratic formula
diff --git a/pyproject.toml b/pyproject.toml
index f46ff93..6cc7a6a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -5,7 +5,7 @@ build-backend = "setuptools.build_meta"
 [project]
 # --- Core Metadata ---
 name = "polysolve"
-version = "0.2.0"
+version = "0.2.1"
 authors = [
   { name="Jonathan Rampersad", email="jonathan@jono-rams.work" },
 ]