diff --git a/httprunner/runner.py b/httprunner/runner.py
index 1742f249..78f190f6 100644
--- a/httprunner/runner.py
+++ b/httprunner/runner.py
@@ -102,6 +102,7 @@ class Runner(object):
     def do_hook_actions(self, actions):
         for action in actions:
             logger.log_debug("call hook: {}".format(action))
+            # TODO: check hook function if valid
             self.context.eval_content(action)
 
     def run_test(self, testcase_dict):