Index: b/docs/conf.py
===================================================================
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -301,7 +301,7 @@ texinfo_documents = [
 
 # Example configuration for intersphinx: refer to the Python standard library.
 intersphinx_mapping = {
-    "https://docs.python.org/3/": None,
-    "https://pyopenssl.readthedocs.io/en/stable": None,
-    "https://cryptography.io/en/stable/": None,
+    "https://docs.python.org/3/": "python3.inv",
+    "https://pyopenssl.readthedocs.io/en/stable": "pyopenssl.inv",
+    "https://cryptography.io/en/stable/": "crypto.inv",
 }