diff --git a/src/calibre/srv/tests/base.py b/src/calibre/srv/tests/base.py
index c80afa371c..a2a7ca670b 100644
--- a/src/calibre/srv/tests/base.py
+++ b/src/calibre/srv/tests/base.py
@@ -25,6 +25,7 @@ class BaseTest(unittest.TestCase):
     ae = unittest.TestCase.assertEqual
 
     def run(self, result=None):
+        # we retry failing server tests since they are flaky on CI
         if result is None:
             result = self.defaultTestResult()
         max_retries = 1