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prerequisites

-                      v19
+                      v20
 = Installing the `rJava` package
 [http://cran.r-project.org/web/packages/rJava/index.html rJava] is a R package providing a low-level interface to Java from R. If Java is installed and adequately configured in your computer, the `rJava` package will be automatically downloaded if not present when installing the `loadR` package, as any other package dependency. `rJava` can be also installed directly by:
+[http://cran.r-project.org/web/packages/rJava/index.html rJava] is a R package providing a low-level interface to Java from R. If Java is installed and adequately configured in your computer, the `rJava` package will be automatically downloaded if not present when installing the `loadeR` package, as any other package dependency. `rJava` can be also installed directly by:
 {{{
 #!text/R
 …
 }}}
+Note that if you upload Java, you should run the following command to set all Java variables:
+{{{
+~$ sudo R CMD javareconf
+}}}
 Therefore, in principle you should not worry about this and could skip this section. But just in case something related to `rJava` goes wrong during the installation, please bear in mind the following information: