diff --git a/guide/english/machine-learning/unsupervised-learning/index.md b/guide/english/machine-learning/unsupervised-learning/index.md
index 6659a20ff2..5d1b1c095b 100644
--- a/guide/english/machine-learning/unsupervised-learning/index.md
+++ b/guide/english/machine-learning/unsupervised-learning/index.md
@@ -7,6 +7,7 @@ title: Unsupervised Learning
 - https://en.wikipedia.org/wiki/Unsupervised_learning
 - https://stackoverflow.com/a/1854449/6873133
 - http://mlg.eng.cam.ac.uk/zoubin/papers/ul.pdf
+- https://www.datasciencecentral.com/profiles/blogs/machine-learning-explained-understanding-supervised-unsupervised
 
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