1 files changed, 3 insertions, 1 deletions
diff --git a/synapse/python_dependencies.py b/synapse/python_dependencies.py
index dd77a44b8d..2d995ec456 100644
--- a/synapse/python_dependencies.py
+++ b/synapse/python_dependencies.py
@@ -66,7 +66,9 @@ REQUIREMENTS = [
     "msgpack>=0.5.2",
     "phonenumbers>=8.2.0",
     "prometheus_client>=0.0.18,<0.9.0",
-    # we use attr.validators.deep_iterable, which arrived in 19.1.0
+    # we use attr.validators.deep_iterable, which arrived in 19.1.0 (Note:
+    # Fedora 31 only has 19.1, so if we want to upgrade we should wait until 33
+    # is out in November.)
     "attrs>=19.1.0",
     "netaddr>=0.7.18",
     "Jinja2>=2.9",