diff --git a/sphinx/ext/autodoc/__init__.py b/sphinx/ext/autodoc/__init__.py
index cfca54225..f44d2a893 100644
--- a/sphinx/ext/autodoc/__init__.py
+++ b/sphinx/ext/autodoc/__init__.py
@@ -1755,7 +1755,7 @@ def setup(app: Sphinx) -> Dict[str, Any]:
     app.add_autodocumenter(InstanceAttributeDocumenter)
     app.add_autodocumenter(SlotsAttributeDocumenter)
 
-    app.add_config_value('autoclass_content', 'class', True)
+    app.add_config_value('autoclass_content', 'class', True, ENUM('both', 'class', 'init'))
     app.add_config_value('autodoc_member_order', 'alphabetic', True)
     app.add_config_value('autodoc_default_flags', [], True)
     app.add_config_value('autodoc_default_options', {}, True)