felixcheung commented on a change in pull request #25647: 
[SPARK-28946][R][DOCS] Add some more information about building SparkR on 
Windows
URL: https://github.com/apache/spark/pull/25647#discussion_r320566075
 
 

 ##########
 File path: R/WINDOWS.md
 ##########
 @@ -20,25 +20,28 @@ license: |
 
 To build SparkR on Windows, the following steps are required
 
-1. Install R (>= 3.1) and 
[Rtools](https://cloud.r-project.org/bin/windows/Rtools/). Make sure to
+1. Make sure `bash` is available and in `PATH` if you already have a built-in 
`bash` on Windows. If you do not have, install 
[Cygwin](https://www.cygwin.com/).
+
+2. Install R (>= 3.1) and 
[Rtools](https://cloud.r-project.org/bin/windows/Rtools/). Make sure to
 include Rtools and R in `PATH`. Note that support for R prior to version 3.4 
is deprecated as of Spark 3.0.0.
 
-2. Install
-[JDK8](https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html)
 and set
+3. Install [JDK](https://www.oracle.com/technetwork/java/javase/downloads) 
that SparkR supports - see `R/pkg/DESCRIPTION`, and set
 `JAVA_HOME` in the system environment variables.
 
-3. Download and install [Maven](https://maven.apache.org/download.html). Also 
include the `bin`
+4. Download and install [Maven](https://maven.apache.org/download.html). Also 
include the `bin`
 
 Review comment:
   we meant the `maven version` part

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