Tutorial.md

@@ -58,6 +58,8 @@ First, install the library from github
  devtools::install_github("OHDSI/ETL-Synthea")
 ```
 
+> Since ETL-Synthea requires rJava you may need to run `R CMD javareconf` to setup the required environmental variables
+ 
 And run the following code
 
 ```r