Grammar fix
diff --git a/Doc/whatsnew/2.5.rst b/Doc/whatsnew/2.5.rst
index a5169f3..925fd0f 100644
--- a/Doc/whatsnew/2.5.rst
+++ b/Doc/whatsnew/2.5.rst
@@ -2205,10 +2205,10 @@
* MacOS X (10.3 and higher): dynamic loading of modules now uses the
:cfunc:`dlopen` function instead of MacOS-specific functions.
-* MacOS X: a :option:`--enable-universalsdk` switch was added to the
+* MacOS X: an :option:`--enable-universalsdk` switch was added to the
:program:`configure` script that compiles the interpreter as a universal binary
able to run on both PowerPC and Intel processors. (Contributed by Ronald
- Oussoren.)
+ Oussoren; :issue:`2573`.)
* Windows: :file:`.dll` is no longer supported as a filename extension for
extension modules. :file:`.pyd` is now the only filename extension that will be