diff --git a/doc/source/groupby.rst b/doc/source/groupby.rst
index 1c4c3f93726a9..47d53c82b86f3 100644
--- a/doc/source/groupby.rst
+++ b/doc/source/groupby.rst
@@ -680,8 +680,7 @@ match the shape of the input array.
    data_range = lambda x: x.max() - x.min()
    ts.groupby(key).transform(data_range)
 
-Alternatively the built-in methods can be could be used to produce the same
-outputs
+Alternatively, the built-in methods could be used to produce the same outputs.
 
 .. ipython:: python