diff --git a/doc/usage/restructuredtext/directives.rst b/doc/usage/restructuredtext/directives.rst
index 933d213c9..b5b0a2980 100644
--- a/doc/usage/restructuredtext/directives.rst
+++ b/doc/usage/restructuredtext/directives.rst
@@ -885,7 +885,7 @@ mainly contained in information units, such as the language reference.
         .. index:: Python
            :name: py-index
 
-   .. versionadded:: 2.5
+   .. versionadded:: 3.0
 
 .. rst:role:: index
 
diff --git a/sphinx/domains/index.py b/sphinx/domains/index.py
index 44431eed5..7aa1018f5 100644
--- a/sphinx/domains/index.py
+++ b/sphinx/domains/index.py
@@ -71,7 +71,7 @@ class IndexDirective(SphinxDirective):
     final_argument_whitespace = True
     option_spec = {
         'name': directives.unchanged,
-    }  # type: Dict
+    }
 
     def run(self) -> List[Node]:
         arguments = self.arguments[0].split('\n')