diff --git a/Job-configuration.md b/Job-configuration.md
index 94bb740..2245f20 100644
--- a/Job-configuration.md
+++ b/Job-configuration.md
@@ -208,11 +208,14 @@ in the job config file.
 	  defined task is automatically external
 		- **name** -- name of used sandbox
 		- _stdin_ -- file to which standard input will be redirected, can be
-		  omitted; job variables can be used, usually `${SOURCE_DIR}`
+		  omitted; job variables can be used, usually `${EVAL_DIR}`, has to
+		  be accessible inside sandbox
 		- _stdout_ -- file to which standard output will be redirected, can be
-		  omitted; job variables can be used, usually `${SOURCE_DIR}`
+		  omitted; job variables can be used, usually `${EVAL_DIR}`, has to
+		  be accessible inside sandbox
 		- _stderr_ -- file to which error output will be redirected, can be
-		  omitted; job variables can be used, usually `${SOURCE_DIR}`
+		  omitted; job variables can be used, usually `${EVAL_DIR}`, has to
+		  be accessible inside sandbox
 		- _output_ -- true/false, if true then output from stdout and stderr
 		  (in that order) will be written in `result.yaml`, limitation on
 		  length defined in worker configuration