[Truffle] Document use of -J-Djvmci.Compiler=graal

jruby · Mar 14, 2016 · cd68aec · cd68aec
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commit cd68aec
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/truffle/README.md b/truffle/README.md
@@ -45,10 +45,10 @@ But you can also build it yourself, which you will need to do if you are on the
 https://github.com/jruby/jruby/wiki/Building-Graal
 
 You then need to set the `JAVACMD` environment variable as described on those
-pages.
+pages, and tell the JVM to use the Graal compiler.
 
 ```
-$ JAVACMD=... bin/jruby -X+T ...
+$ JAVACMD=... bin/jruby -X+T -J-Djvmci.Compiler=graal ...
 ```
 
 ### What to expect