diff --git a/sphinx/domains/__init__.py b/sphinx/domains/__init__.py
index eac05327c09..f1adbaf62a5 100644
--- a/sphinx/domains/__init__.py
+++ b/sphinx/domains/__init__.py
@@ -426,7 +426,16 @@ def intersphinx_add_entries_v2(self, store: Any,
         that should not be inspected by the domain, but merely returned as a result
         of reference resolution.
 
-        The domain must store the given data in the given *store*,
+        For example, for Python the data could look like the following.
+
+        .. code-block:: python
+
+            data = {
+                'class': {'pkg.mod.Foo': SomeIntersphinxData(...)},
+                'method': {'pkg.mod.Foo.bar': SomeIntersphinxData(...)},
+            }
+
+        The domain must store the given inner intersphinx data in the given *store*,
         in whichever way makes sense for later reference resolution.
         This *store* was initially a copy of :attr:`initial_intersphinx_inventory`.