diff --git a/ros2autodoc/api/doc_writer.py b/ros2autodoc/api/doc_writer.py
index fda3e53..b2ac246 100644
--- a/ros2autodoc/api/doc_writer.py
+++ b/ros2autodoc/api/doc_writer.py
@@ -35,6 +35,8 @@ def get_parameters(self, param_names, params_map, desciption_map):
             if param not in PARAMS_TO_IGNORE:
                 param_type = params_map[param]
                 param_description = desciption_map[param]
+                if not param_description:
+                    param_description = TODO
                 self.parameters.append(
                     {
                         "name": param,