diff --git a/sphinx/registry.py b/sphinx/registry.py
index cc2db06e5..f6dc2771f 100644
--- a/sphinx/registry.py
+++ b/sphinx/registry.py
@@ -21,7 +21,7 @@ from docutils.nodes import Element, Node, TextElement
 from docutils.parsers import Parser
 from docutils.parsers.rst import Directive
 from docutils.transforms import Transform
-try:
+try:  # Python < 3.10 (backport)
     from importlib_metadata import entry_points
 except ImportError:
     from importlib.metadata import entry_points