diff --git a/python/docs/pyspark.ml.rst b/python/docs/pyspark.ml.rst
index 564bc72f29aec..86d4186a2c798 100644
--- a/python/docs/pyspark.ml.rst
+++ b/python/docs/pyspark.ml.rst
@@ -34,7 +34,7 @@ pyspark.ml.classification module
     :inherited-members:
 
 pyspark.ml.clustering module
---------------------------------
+----------------------------
 
 .. automodule:: pyspark.ml.clustering
     :members: