diff --git a/README.md b/README.md
index 28c2d4c..c152538 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,14 @@ conda activate ctapipe-io_magic
 pip install .
 ```
 
+### Test Data
+
+To run the tests, a set of non-public files is needed. If you are a member of MAGIC, ask one of the project maintainers for the credentials and then run:
+
+```bash
+./download_test_data.sh
+```
+
 #### Usage
 
 ```python