Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/21020#discussion_r180312977
--- Diff: docs/README.md ---
@@ -22,10 +22,13 @@ $ sudo gem install jekyll jekyll-redirect-from
pygments.rb
$ sudo pip install Pygments
# Following is needed only for generating API docs
$ sudo pip install sphinx pypandoc mkdocs
-$ sudo Rscript -e 'install.packages(c("knitr", "devtools", "roxygen2",
"testthat", "rmarkdown"), repos="http://cran.stat.ucla.edu/";)'
+$ sudo Rscript -e 'install.packages(c("knitr", "devtools", "testthat",
"rmarkdown"), repos="http://cran.stat.ucla.edu/";)'
+$ sudo Rscript -e 'devtools::install_version("roxygen2", version =
"5.0.1", repos="http://cran.stat.ucla.edu/";)'
```
-(Note: If you are on a system with both Ruby 1.9 and Ruby 2.0 you may need
to replace gem with gem2.0)
+Note: If you are on a system with both Ruby 1.9 and Ruby 2.0 you may need
to replace gem with gem2.0.
+
+Note: Other versions of roxygen2 might work in SparkR documentation
generation but `RoxygenNote` field in `SPARK_HOME/R/pkg/DESCRIPTION` is 5.0.1,
which is updated if the version is mismatched.
--- End diff --
nit `$SPARK_HOME/R/pkg/DESCRIPTION`?
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