diff --git a/poky/documentation/migration-guides/migration-2.4.rst b/poky/documentation/migration-guides/migration-2.4.rst
index 8904495..9637301 100644
--- a/poky/documentation/migration-guides/migration-2.4.rst
+++ b/poky/documentation/migration-guides/migration-2.4.rst
@@ -1,3 +1,5 @@
+.. SPDX-License-Identifier: CC-BY-SA-2.0-UK
+
 Release 2.4 (rocko)
 ===================
 
@@ -195,12 +197,10 @@
 -----------------------
 
 Kernel Device Tree support is now easier to enable in a kernel recipe.
-The Device Tree code has moved to a
-:ref:`kernel-devicetree <ref-classes-kernel-devicetree>` class.
+The Device Tree code has moved to a :ref:`ref-classes-kernel-devicetree` class.
 Functionality is automatically enabled for any recipe that inherits the
-:ref:`kernel <ref-classes-kernel>` class and sets the
-:term:`KERNEL_DEVICETREE` variable. The
-previous mechanism for doing this,
+:ref:`kernel <ref-classes-kernel>` class and sets the :term:`KERNEL_DEVICETREE`
+variable. The previous mechanism for doing this,
 ``meta/recipes-kernel/linux/linux-dtb.inc``, is still available to avoid
 breakage, but triggers a deprecation warning. Future releases of the
 Yocto Project will remove ``meta/recipes-kernel/linux/linux-dtb.inc``.
@@ -269,11 +269,11 @@
    from ``meta-poky`` to OE-Core (i.e. from
    ``meta-poky/conf/distro/include`` to ``meta/conf/distro/include``).
 
--  The :ref:`buildhistory <ref-classes-buildhistory>` class now makes
+-  The :ref:`ref-classes-buildhistory` class now makes
    a single commit per build rather than one commit per subdirectory in
    the repository. This behavior assumes the commits are enabled with
    :term:`BUILDHISTORY_COMMIT` = "1", which
-   is typical. Previously, the :ref:`buildhistory <ref-classes-buildhistory>` class made one commit
+   is typical. Previously, the :ref:`ref-classes-buildhistory` class made one commit
    per subdirectory in the repository in order to make it easier to see
    the changes for a particular subdirectory. To view a particular
    change, specify that subdirectory as the last parameter on the