viirya commented on a change in pull request #29385:
URL: https://github.com/apache/spark/pull/29385#discussion_r467142492



##########
File path: python/docs/source/migration_guide/index.rst
##########
@@ -20,3 +20,14 @@
 Migration Guide
 ===============
 
+Migration Guide: PySpark (Python on Spark)
+
+Note that this migration guide describes the items specific to PySpark.
+Many items of SQL migration can be applied when migrating PySpark to higher 
versions.
+Please refer `Migration Guide: SQL, Datasets and DataFrame 
<http://spark.apache.org/docs/latest/sql-migration-guide.html>`_.
+
+.. toctree::
+   :maxdepth: 2
+
+   pyspark_2.4_to_3.0

Review comment:
       Question: do we want to move all old migration guide?




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