diff --git a/doc/source/index.rst b/doc/source/index.rst
index a802f395f..bc5069c6d 100644
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -5,6 +5,7 @@
 
    install
    policy
+   mirror
    jobs
    roles
    docker-image
diff --git a/doc/source/mirror.rst b/doc/source/mirror.rst
new file mode 100644
index 000000000..91bcafa02
--- /dev/null
+++ b/doc/source/mirror.rst
@@ -0,0 +1,131 @@
+Mirror Configuration
+====================
+
+Many roles in `zuul-jobs` can be made aware of local mirrors of
+Internet services.  If site mirrors are present, they expect to find a
+variable named ``mirror_info``, or ``zuul_site_mirror_info`` if that
+is not defined.  This variable is a dictionary which holds keys for
+each type of mirror that one or more roles in `zuul-jobs` can work
+with.
+
+.. note:: The following example defines a local variable
+          ``zuul_site_local_mirror_host`` for convenience, but it is
+          not part of the API -- it is only used in defining the
+          mirror info dictionary.
+
+For example:
+
+.. code-block:: yaml
+
+   zuul_site_local_mirror_host: "mirror.{{ nodepool.region | lower }}.{{ nodepool.cloud | lower }}.example.org"
+
+   zuul_site_mirror_info:
+     pypi:
+       url: https://{{ zuul_site_local_mirror_host }}/pypi/simple
+     wheel:
+       url: https://{{ zuul_site_local_mirror_host }}/wheel
+     fedora:
+       url: https://{{ zuul_site_local_mirror_host }}/fedora
+     opensuse:
+       url: https://{{ zuul_site_local_mirror_host }}/opensuse
+     debian:
+       - url: https://{{ zuul_site_local_mirror_host }}/debian
+         components: ['main']
+       - url: https://{{ zuul_site_local_mirror_host }}/debian-security
+         components: ['main']
+     ubuntu:
+       - url: https://{{ zuul_site_local_mirror_host }}/ubuntu
+         components: ['main', 'universe']
+         trusted: true
+       - url: https://{{ zuul_site_local_mirror_host }}/ubuntu-security
+         components: ['main', 'universe']
+         trusted: true
+     dockerhub:
+       url: https://{{ zuul_site_local_mirror_host }}:8082/
+
+
+.. zuul:rolevar:: mirror_info
+
+   A dictionary which contains information about the various mirrors
+   available.  Each type of mirror is a key in this dictionary; if it
+   is not present, then the site does not have that mirror.
+
+   .. zuul:rolevar:: pypi
+
+      .. zuul:rolevar:: url
+
+         The URL for a PyPI mirror.
+
+   .. zuul:rolevar:: wheel
+
+      .. zuul:rolevar:: url
+
+         The URL for a Python wheel mirror.
+
+   .. zuul:rolevar:: fedora
+
+      .. zuul:rolevar:: url
+
+         The URL for a Fedora mirror.
+
+   .. zuul:rolevar:: epel
+
+      .. zuul:rolevar:: url
+
+         The URL for an EPEL mirror.
+
+   .. zuul:rolevar:: opensuse
+
+      .. zuul:rolevar:: url
+
+         The URL for an openSUSE mirror.
+
+   .. zuul:rolevar:: debian
+      :type: list
+
+      A list of dictionaries, one for each Debian mirror URL.  This
+      accomodates mirror systems which may have a security mirror at a
+      different URL.
+
+      .. zuul:rolevar:: url
+
+         The URL for a Debian mirror.
+
+      .. zuul:rolevar:: components
+         :type: list
+
+         A list of components available in this mirror (e.g.,
+         ``main``, ``contrib``).
+
+      .. zuul:rolevar:: trusted
+         :default: False
+
+         Set to True in order to tag APT mirrors as trusted.
+
+   .. zuul:rolevar:: ubuntu
+      :type: list
+
+      A list of dictionaries, one for each Ubuntu mirror URL.  This
+      accomodates mirror systems which may have a security mirror at a
+      different URL.
+
+      .. zuul:rolevar:: url
+
+         The URL for an Ubuntu mirror.
+
+      .. zuul:rolevar:: components
+         :type: list
+
+         A list of components available in this mirror (e.g.,
+         ``main``, ``contrib``).
+
+      .. zuul:rolevar:: trusted
+         :default: False
+
+         Set to True in order to tag APT mirrors as trusted.
+
+   .. zuul:rolevar:: dockerhub
+
+      .. zuul:rolevar:: url
+
+         The URL for a Docker Hub mirror.