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diff --git a/doc/ref_manual.rst b/doc/ref_manual.rst
index 63b0a9ccf..a23a657c7 100644
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@@ -399,6 +399,10 @@ different.
conflicting files from multiple images. The created nfsroot directory is
``<platform-dir>/nfsroot/<image-name>``.
+``<PKG>_LABEL``
+ This is a tar label to put on an image. This is supported by
+ ``image-root-tgz`` and images created with the ``image-tgz`` template.
+
.. _reference_macros:
Rule File Macro Reference