[MNG-6151] Reset to integration test state as of 3.3.9 release of core
diff --git a/README.md b/README.md
index 47233cb..5533363 100644
--- a/README.md
+++ b/README.md
@@ -21,4 +21,16 @@
<http://maven.apache.org/core-its/>
+If you want to run the integration tests against a custom build of Maven use the following command:
+
+```
+mvn clean install -Prun-its -Dmaven.repo.local=`pwd`/repo -DmavenDistro=/path/to/apache-maven-dist.zip
+```
+
+or if behind a proxy
+
+```
+mvn clean install -Prun-its -Dmaven.repo.local=`pwd`/repo -DmavenDistro=/path/to/apache-maven-dist.zip -Dproxy.active=true -Dproxy.type=http -Dproxy.host=... -Dproxy.port=... -Dproxy.user=... -Dproxy.pass=...
+```
+
Maven Developers List: dev@maven.apache.org
