diff --git a/PlaneStress.png b/PlaneStress.png
new file mode 100644
index 0000000..c983a2c
Binary files /dev/null and b/PlaneStress.png differ
diff --git a/README.md b/README.md
index 9a66495..b5a1708 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,18 @@
 # Aero-Astro-Calc
 
 A small python library with functions to assist engineers.
+
+## Usage
+
+### Code:
+
+```python
+from aero_astro_calc import PlaneStress
+
+stress = PlaneStress(80, -40, 25)
+stress.plane()
+```
+
+### Output:
+
+![Plane Stress example](PlaneStress.png)