Index: b/doc/conf.py
===================================================================
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -254,6 +254,6 @@ man_pages = [
 ]
 
 intersphinx_mapping = {
-    "https://docs.python.org/3": None,
-    "https://cryptography.io/en/latest/": None,
+    "https://docs.python.org/3": "python3.inv",
+    "https://cryptography.io/en/latest/": "crypto.inv",
 }