diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index 3e3b1df377..043722d823 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -2801,6 +2801,10 @@ system and gives an overview of their function and contents.
       For guidance on how to create your own file permissions settings
       table file, examine the existing ``fs-perms.txt``.
 
+   :term:`FIT_CONF_PREFIX`
+      When using the :ref:`ref-classes-kernel-fitimage`, this is the prefix
+      used for creating FIT configuration nodes. Its default value is "conf-".
+
    :term:`FIT_DESC`
       Specifies the description string encoded into a fitImage. The default
       value is set by the :ref:`kernel-fitimage <ref-classes-kernel-fitimage>`