diff --git a/doc/extdev/domainapi.rst b/doc/extdev/domainapi.rst
index 674a3aa9a6d..a666fc06d86 100644
--- a/doc/extdev/domainapi.rst
+++ b/doc/extdev/domainapi.rst
@@ -13,6 +13,10 @@ Domain API
 .. autoclass:: Index
    :members:
 
+.. module:: sphinx.directives
+
+.. autoclass:: ObjectDescription
+   :members:
 
 Python Domain
 -------------