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diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
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@@ -4079,6 +4079,12 @@ system and gives an overview of their function and contents.
4079 added to the image by using the :term:`IMAGE_ROOTFS_EXTRA_SPACE` 4079 added to the image by using the :term:`IMAGE_ROOTFS_EXTRA_SPACE`
4080 variable. 4080 variable.
4081 4081
4082 When using Wic tool, beware that a second overhead factor is also applied.
4083 This overhead value is defined by the ``--overhead-factor`` option, which
4084 defaults to "1.3" when omitted. See the
4085 :ref:`ref-manual/kickstart:command: part or partition` chapter in
4086 :doc:`/ref-manual/kickstart` for details.
4087
4082 :term:`IMAGE_PKGTYPE` 4088 :term:`IMAGE_PKGTYPE`
4083 Defines the package type (i.e. DEB, RPM or IPK) used by the 4089 Defines the package type (i.e. DEB, RPM or IPK) used by the
4084 OpenEmbedded build system. The variable is defined appropriately by 4090 OpenEmbedded build system. The variable is defined appropriately by