diff --git a/README.md b/README.md
new file mode 100644
index 0000000..892db28
--- /dev/null
+++ b/README.md
@@ -0,0 +1,12 @@
+# SCD4x library
+
+Simple library for [Sensirion SCD4x](https://sensirion.com/products/catalog/SCD40) sensors. Work in progress.
+
+## Usage
+
+Implement all functions marked by the `__weak__` pragma.
+
+# License
+
+This project is licensed under the MIT License. See the [LICENSE](./LICENSE) file for details.
+