diff --git a/tests/coveragetest.py b/tests/coveragetest.py
index e97f914b8..08edd62fa 100644
--- a/tests/coveragetest.py
+++ b/tests/coveragetest.py
@@ -97,6 +97,7 @@ def setUp(self):
         self.last_module_name = None
 
     def skip_unless_data_storage_is(self, storage):
+        """Skip a test for tests that are particular about the storage implementation."""
         if STORAGE != storage:
             self.skipTest("Not using {} for data storage".format(storage))
 
diff --git a/tests/test_html.py b/tests/test_html.py
index 8c6dc6936..ad8087fd8 100644
--- a/tests/test_html.py
+++ b/tests/test_html.py
@@ -764,6 +764,7 @@ def test_isolatin1(self):
         )
 
     def make_main_etc(self):
+        """Make main.py and m1-m3.py for other tests."""
         self.make_file("main.py", """\
             import m1
             import m2