diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index d1bbc437f..b7846585e 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -3454,17 +3454,9 @@ system and gives an overview of their function and contents.
    :term:`FIT_KERNEL_COMP_ALG`
       The compression algorithm to use for the kernel image inside the FIT Image.
       At present, the only supported values are "gzip" (default), "lzo" or "none".
-      If you set this variable to anything other than "none" you may also need
-      to set :term:`FIT_KERNEL_COMP_ALG_EXTENSION`.
 
       This variable is used in the :ref:`ref-classes-kernel-uboot` class.
 
-   :term:`FIT_KERNEL_COMP_ALG_EXTENSION`
-      File extension corresponding to :term:`FIT_KERNEL_COMP_ALG`. The default
-      value is set ".gz" by the :ref:`ref-classes-kernel-uboot` class. If you
-      set :term:`FIT_KERNEL_COMP_ALG` to "lzo", you may want to set this
-      variable to ".lzo".
-
    :term:`FIT_KERNEL_SIGN_ENABLE`
       This variable is used by the :ref:`ref-classes-kernel-fit-image` class
       to enable or disable signing of the FIT image.