diff --git a/doc/releases/migration-guide-4.0.rst b/doc/releases/migration-guide-4.0.rst
index 6c0f35ac5d4374f..e005e495af65f02 100644
--- a/doc/releases/migration-guide-4.0.rst
+++ b/doc/releases/migration-guide-4.0.rst
@@ -37,6 +37,9 @@ Boards
   :ref:`native_sim<native_sim>` (:github:`76898`).
 * Nordic nRF53 and nRF91 based boards can use the common devicetree overlays in ``dts/common/nordic``
   to define default flash and ram partitioning based on TF-M.
+* ``mimxrt1050_evk`` and ``mimxrt1060_evk`` revisions for ``qspi`` and ``hyperflash`` have been
+  converted into variants. ``mimxrt1060_evkb`` has been converted into revision ``B`` of
+  ``mimxrt1060_evk``.
 
 * STM32WBA: The command used for fetching blobs required to build ble applications is now
   ``west blobs fetch hal_stm32`` instead of ``west blobs fetch stm32``.
diff --git a/doc/releases/release-notes-4.0.rst b/doc/releases/release-notes-4.0.rst
index b470f5c4f2c362a..7526f77e3386dcd 100644
--- a/doc/releases/release-notes-4.0.rst
+++ b/doc/releases/release-notes-4.0.rst
@@ -134,6 +134,9 @@ Boards & SoC Support
   * Support for Google Kukui EC board (``google_kukui``) has been dropped.
   * STM32: Deprecated MCO configuration via Kconfig in favour of setting it through devicetree.
     See ``samples/boards/stm32/mco`` sample.
+  * ``mimxrt1050_evk`` and ``mimxrt1060_evk`` revisions for ``qspi`` and ``hyperflash`` have been
+    converted into variants. ``mimxrt1060_evkb`` has been converted into revision ``B`` of
+    ``mimxrt1060_evk``.
 
 * Added support for the following shields: