- Note about POUT in README

Author: Alan Christie

README.md

@@ -101,9 +101,9 @@ You can use the docker-specific Gradle task: -
 
     $ ./gradlew runDockerPipelineTester
 
-Or, by add the `-d` or `--indocker` command-line argument into the basic
-task. To pass these variables through Gradle into the pipeline tester
-run the Docker tests like this: -
+Or, by adding the `-d` or `--indocker` command-line argument into the basic
+task. To pass command-line options through Gradle into the underlying task
+you can also run the Docker tests like this: -
 
     $ ./gradlew runPipelineTester -Pptargs=-d
 
@@ -122,6 +122,11 @@ for every file and test combination. For example, if the test file
 `pbf_ev.test` contains the test `test_pbf_ev_raw` any files it generates
 will be found in the directory `pbf_ev-test_pbf_ev_raw`.
 
+You can re-direct the test output to an existing directory of your choice by
+defining the Environment variable `POUT`: -
+
+    $ export POUT=/tmp/my-output-dir/
+    
 Some important notes: -
 
 -   Files generated by the pipelines are removed when the tester is