diff --git a/doc/usage/extensions/duration.rst b/doc/usage/extensions/duration.rst
index c5754998402..1213811daf0 100644
--- a/doc/usage/extensions/duration.rst
+++ b/doc/usage/extensions/duration.rst
@@ -4,7 +4,7 @@
 .. module:: sphinx.ext.duration
    :synopsis: Measure durations of Sphinx processing
 
-.. versionadded:: 2.3
+.. versionadded:: 2.4
 
 This extension measures durations of Sphinx processing and show its
 result at end of the build.  It is useful for inspecting what document