diff --git a/README.rst b/README.rst
index c8243e8..eebb060 100644
--- a/README.rst
+++ b/README.rst
@@ -63,6 +63,11 @@ Usage Example
 
 For example usage, see examples/pm25_simpletest.py
 
+Documentation
+=============
+
+API documentation for this library can be found on `Read the Docs <https://circuitpython.readthedocs.io/projects/pm25/en/latest/>`_.
+
 Contributing
 ============