merge from trunk
diff --git a/Doc/whatsnew/2.4.rst b/Doc/whatsnew/2.4.rst
index bf30ac1..59788ba 100644
--- a/Doc/whatsnew/2.4.rst
+++ b/Doc/whatsnew/2.4.rst
@@ -1551,7 +1551,7 @@
 .. ======================================================================
 
 
-.. _acks:
+.. _24acks:
 
 Acknowledgements
 ================