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-rw-r--r--doc/rtd/topics/datasources.rst1
-rw-r--r--doc/rtd/topics/datasources/gce.rst20
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diff --git a/doc/rtd/topics/datasources.rst b/doc/rtd/topics/datasources.rst
index a60f5eb7..7e2854de 100644
--- a/doc/rtd/topics/datasources.rst
+++ b/doc/rtd/topics/datasources.rst
@@ -94,5 +94,6 @@ Follow for more information.
datasources/ovf.rst
datasources/smartos.rst
datasources/fallback.rst
+ datasources/gce.rst
.. vi: textwidth=78
diff --git a/doc/rtd/topics/datasources/gce.rst b/doc/rtd/topics/datasources/gce.rst
new file mode 100644
index 00000000..8406695c
--- /dev/null
+++ b/doc/rtd/topics/datasources/gce.rst
@@ -0,0 +1,20 @@
+.. _datasource_gce:
+
+Google Compute Engine
+=====================
+
+The GCE datasource gets its data from the internal compute metadata server.
+Metadata can be queried at the URL
+'``http://metadata.google.internal/computeMetadata/v1/``'
+from within an instance. For more information see the `GCE metadata docs`_.
+
+Currently the default project and instance level metadatakeys keys
+``project/attributes/sshKeys`` and ``instance/attributes/ssh-keys`` are merged
+to provide ``public-keys``.
+
+``user-data`` and ``user-data-encoding`` can be provided to cloud-init by
+setting those custom metadata keys for an *instance*.
+
+.. _GCE metadata docs: https://cloud.google.com/compute/docs/storing-retrieving-metadata#querying
+
+.. vi: textwidth=78