TST: more specific comment

ivanovmg · ivanovmg · commit 8a71526448bd · 2020-12-01T10:34:00.000+07:00
diff --git a/pandas/tests/plotting/common.py b/pandas/tests/plotting/common.py
@@ -1,7 +1,8 @@
 """
 Module consolidating common testing functions for checking plotting.
 
-Currently all plotting tests are marked as slow.
+Currently all plotting tests are marked as slow via
+``pytestmark = pytest.mark.slow`` at the module level.
 """
 
 import os
