diff --git a/contrib/machine-learning/index.md b/contrib/machine-learning/index.md
index b6945cd..13d9440 100644
--- a/contrib/machine-learning/index.md
+++ b/contrib/machine-learning/index.md
@@ -16,3 +16,4 @@
 - [Types_of_Cost_Functions](cost-functions.md)
 - [Clustering](clustering.md)
 - [Grid Search](grid-search.md)
+- [Transformers](transformers.md)