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-rw-r--r--docs/testing.rst4
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diff --git a/docs/testing.rst b/docs/testing.rst
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--- a/docs/testing.rst
+++ b/docs/testing.rst
@@ -19,6 +19,10 @@ If your Java setup is complex, you may also override our classpath mechanism
completely by specifying an environment variable called `ZOOKEEPER_CLASSPATH`.
If provided, it will be used unmodified as the Java classpath for Zookeeper.
+You can specify an optional `ZOOKEEPER_PORT_OFFSET` environment variable to
+influence the ports the cluster is using. By default the offset is 20000 and
+a cluster with three members will use ports 20000, 20010 and 20020.
+
Kazoo Test Harness
==================