a -> an

weaverryan · weaverryan · commit f2a40f74ca51 · 2017-02-16T19:38:01.000-05:00
diff --git a/contributing/code/experimental.rst b/contributing/code/experimental.rst
@@ -15,7 +15,7 @@ be marked as **experimental** and their classes and methods must be marked with
 the ``@experimental`` tag.
 
 A feature can be marked as being experimental for only one minor version, and
-can never be introduced in a :ref:`LTS version <releases-lts>`. The core team
+can never be introduced in an :ref:`LTS version <releases-lts>`. The core team
 can decide to extend the experimental period for another minor version on a
 case by case basis.
 
