diff --git a/km3net_testdata/__main__.py b/km3net_testdata/__main__.py
new file mode 100644
index 0000000000000000000000000000000000000000..f5d277f4da2f8a3d0fd491ef6740e96d89977986
--- /dev/null
+++ b/km3net_testdata/__main__.py
@@ -0,0 +1,19 @@
+"""
+This file will be invoked by python when called with th `-m` options:
+```
+python -m skhep_testdata cms_hep_2012_tutorial/data.root
+```
+"""
+from __future__ import print_function
+import argparse
+from . import data_path
+
+
+if __name__ == "__main__":
+    description = "Expand a testing dataset path to a full path."
+    parser = argparse.ArgumentParser(prog="km3net_testdata")
+    parser.add_argument("file_path", help="path to expand", type=str)
+    args = parser.parse_args()
+
+    path = data_path(args.file_path)
+    print(path)