diff --git a/doc/sphinx/source/conf.py b/doc/sphinx/source/conf.py
index 359867acfa0..d9e34b060ba 100644
--- a/doc/sphinx/source/conf.py
+++ b/doc/sphinx/source/conf.py
@@ -289,6 +289,7 @@
 # options for external link plugin
 extlinks = {
 'sgissue': ('https://github.com/shogun-toolbox/shogun/issues/%s',        'issue '),
-'sgclass': ('http://www.shogun-toolbox.org/doc/en/latest/classshogun_1_1%s.html',        '')
+'sgclass': ('http://www.shogun-toolbox.org/doc/en/latest/classshogun_1_1%s.html',        ''),
+'wiki': ('https://en.wikipedia.org/wiki/%s',        'Wikipedia: ')
 
 }
diff --git a/doc/sphinx/source/examples/classifier/knn.rst b/doc/sphinx/source/examples/classifier/knn.rst
index e3c1cf0ebca..6597513aa99 100644
--- a/doc/sphinx/source/examples/classifier/knn.rst
+++ b/doc/sphinx/source/examples/classifier/knn.rst
@@ -37,6 +37,6 @@ Then we run the KNN algorithm and apply it to test data.
 ----------
 References
 ----------
-`KNN on Wikipedia <https://en.wikipedia.org/wiki/K-nearest_neighbors_algorithm>`_
+:wiki:`K-nearest_neighbors_algorithm`
 
 .. bibliography:: ../../references.bib