diff --git a/doc/conf.py b/doc/conf.py
index dea64997c5c73f553104c1f7d214f6181d209f87..89834add8f44768b812d513af75f5a6dbebc2a24 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -180,4 +180,5 @@ intersphinx_mapping = {
     "https://docs.python.org/3": None,
     "https://numpy.org/doc/stable": None,
     "https://documen.tician.de/pymbolic/": None,
+    "https://documen.tician.de/loopy/": None,
     }