diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index 9768d8f5b8..5c18b852d1 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -5036,15 +5036,8 @@ system and gives an overview of their function and contents.
       options not explicitly specified will be disabled in the kernel
       config.
 
-      In case :term:`KCONFIG_MODE` is not set the behaviour will depend on where
-      the ``defconfig`` file is coming from. An "in-tree" ``defconfig`` file
-      will be handled in ``alldefconfig`` mode, a ``defconfig`` file placed
-      in ``${WORKDIR}`` through a meta-layer will be handled in
-      ``allnoconfig`` mode.
-
-      An "in-tree" ``defconfig`` file can be selected via the
-      :term:`KBUILD_DEFCONFIG` variable. :term:`KCONFIG_MODE` does not need to
-      be explicitly set.
+      In case :term:`KCONFIG_MODE` is not set the ``defconfig`` file
+      will be handled in ``allnoconfig`` mode.
 
       A ``defconfig`` file compatible with ``allnoconfig`` mode can be
       generated by copying the ``.config`` file from a working Linux kernel