diff --git a/eris/eris/tools.py b/eris/eris/tools.py
index c806bad..8c91d2d 100755
--- a/eris/eris/tools.py
+++ b/eris/eris/tools.py
@@ -785,6 +785,9 @@ def tool_name_colored(tool, path):
 
 
 if __name__ == "__main__":
+    # Let tools be tested individually...
+    # ./tools.py <tool> <path>
+    # e.g. ./tools.py contents tools.toml
     tool_name, path = sys.argv[1:3]
     tool = locals()[tool_name]
     valid_tools = tools_for_path(path)