diff --git a/doc/source/concept_and_workflow/customize_the_boot_process.rst b/doc/source/concept_and_workflow/customize_the_boot_process.rst
index d2c1b6bc4..5146b508b 100644
--- a/doc/source/concept_and_workflow/customize_the_boot_process.rst
+++ b/doc/source/concept_and_workflow/customize_the_boot_process.rst
@@ -55,7 +55,7 @@ of {kiwi} the following dracut modules are used:
    and ``pxe``. The use of a custom boot image is activated by setting the
    following attribute in the image description:
 
-   .. code:: none
+   .. code:: xml
 
       <type ... initrd_system="kiwi"/>
 
@@ -63,7 +63,7 @@ of {kiwi} the following dracut modules are used:
    a boot image description in the ``boot`` attribute like in the
    following example:
 
-   .. code:: none
+   .. code:: xml
 
       <type ... boot="{exc_netboot}"/>