Github user jerryshao commented on a diff in the pull request:

    https://github.com/apache/spark/pull/14744#discussion_r75633858
  
    --- Diff: docs/configuration.md ---
    @@ -1752,6 +1752,15 @@ showDF(properties, numRows = 200, truncate = FALSE)
         Executable for executing R scripts in client modes for driver. Ignored 
in cluster modes.
       </td>
     </tr>
    +<tr>
    +  <td><code>spark.r.shell.command</code></td>
    +  <td>R</td>
    +  <td>
    +    Executable for executing R shell in both client mode and cluster mode. 
For now sparkr shell only supports
    --- End diff --
    
    It might be not so proper to mention "executing R shell in both client mode 
and cluster mode" in Spark's doc, AFAIK it is a Livy-only feature. sparkr can 
only run in client mode for now in Spark. So described here may confuse the 
user.


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