diff --git a/doc/python/python_intro.rst b/doc/python/python_intro.rst
index 7dc7ef9da..7951fb3d4 100644
--- a/doc/python/python_intro.rst
+++ b/doc/python/python_intro.rst
@@ -147,7 +147,7 @@ XGBoost can use either a list of pairs or a dictionary to set :doc:`parameters <
 
   .. code-block:: python
 
-    evallist = [(dtest, 'eval'), (dtrain, 'train')]
+    evallist = [(dtrain, 'train'), (dtest, 'eval')]
 
 Training
 --------