Update readme

DarkDimius · DarkDimius · commit c11a46e89199 · 2014-02-06T13:43:10.000+01:00
diff --git a/readme.md b/readme.md
@@ -4,6 +4,7 @@ dotty
 The experimental compiler for a Scala dialect based on DOT.
 
 ### To get started:
+You need to have scala source in "../scala"
 ```
   sbt compile
   sbt run
