diff --git a/python-persistent.spec b/python-persistent.spec
index 1b6314c..efaab50 100644
--- a/python-persistent.spec
+++ b/python-persistent.spec
@@ -26,6 +26,7 @@ License:        ZPL-2.1
 Group:          Development/Languages/Python
 URL:            https://github.com/zopefoundation/persistent
 Source:         https://files.pythonhosted.org/packages/source/p/persistent/persistent-%{version}.tar.gz
+# Blocking https://github.com/zopefoundation/persistent/issues/86
 Patch:          persistent-4.2.4.2-switch-off-tests.patch
 # Documentation requirements:
 BuildRequires:  %{python_module Sphinx}