diff --git a/documentation/ref-manual/classes.rst b/documentation/ref-manual/classes.rst
index 5187033f7..54a98bf24 100644
--- a/documentation/ref-manual/classes.rst
+++ b/documentation/ref-manual/classes.rst
@@ -3426,6 +3426,8 @@ The variables used by this class are:
 -  :term:`UBOOT_FIT_USER_SETTINGS`: adds a user-specific snippet to the U-Boot
    Image Tree Source (ITS). Users can include their custom U-Boot Image Tree
    Source (ITS) snippet in this variable.
+-  :term:`UBOOT_FIT_CONF_FIRMWARE`: adds one image to the ``firmware`` property
+   of the configuration node.
 -  :term:`UBOOT_FIT_CONF_USER_LOADABLES`: adds one or more user-defined images
    to the ``loadables`` property of the configuration node.
 
diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index 643a3e7ae..b430fa51f 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -10327,6 +10327,14 @@ system and gives an overview of their function and contents.
 
          do_compile[depends] += "trusted-firmware-a:do_deploy"
 
+   :term:`UBOOT_FIT_CONF_FIRMWARE`
+      Adds one image to the ``firmware`` property of the configuration node
+      of the U-Boot Image Tree Source (ITS). Sets the firmware property to select
+      the image to boot first. If not set, the first entry in "loadables" is used
+      instead.::
+
+         UBOOT_FIT_CONF_FIRMWARE = "fwa"
+
    :term:`UBOOT_FIT_CONF_USER_LOADABLES`
       Adds one or more user-defined images to the ``loadables`` property of the
       configuration node of the U-Boot Image Tree Source (ITS). This variable