Add comment in tools test

diff --git a/rtest/test_tools.py b/rtest/test_tools.py
index 38fa8400e1640cc6348f9adc5e8776bf935a6f94..e4beca204c38c80ee00d1e115ac447716ed96027 100644 (file)
--- a/rtest/test_tools.py
+++ b/rtest/test_tools.py
@@ -141,6 +141,7 @@ def test_tools(tool):
             pytest.skip('gvpack does not find libgvplugin_neato_layout.so.6'
                         'when built with CMake (#1838)')
 
+    # Test usage
     output = subprocess.check_output(
         [tool, '-?'],
         stdin=subprocess.DEVNULL,