diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index 591c03028ce..8a10dfc54e6 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -3430,6 +3430,18 @@ system and gives an overview of their function and contents.
       The default value is set to "x509" by the
       :ref:`ref-classes-kernel-fit-image` class.
 
+   :term:`FIT_LINUX_BIN`
+      This variable is used in the :ref:`ref-classes-kernel-fit-image` class to
+      specify the name of the Linux kernel binary which gets included in the
+      FIT image.
+      The default value is set to "linux.bin".
+
+      If :term:`FIT_LINUX_BIN` is set to an empty string, no kernel binary
+      is included in the FIT image.
+      This might be useful when the FIT image only provides specific components
+      like device trees, while the kernel is delivered as a UKI artifact
+      (see :ref:`ref-classes-uki`).
+
    :term:`FIT_PAD_ALG`
       Specifies the padding algorithm used in creating the FIT Image.
       The default value is set to "pkcs-1.5" by the