From 35d15318aed79043d269362222fea26aad332573 Mon Sep 17 00:00:00 2001
From: kenjis <kenji.uui@gmail.com>
Date: Wed, 27 Sep 2023 10:38:12 +0900
Subject: [PATCH] docs: add changelog and upgrade

---
 user_guide_src/source/changelogs/v4.5.0.rst        | 8 ++++++++
 user_guide_src/source/installation/upgrade_450.rst | 9 ++++++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/user_guide_src/source/changelogs/v4.5.0.rst b/user_guide_src/source/changelogs/v4.5.0.rst
index 50dae35cd5a2..9e4d387f7788 100644
--- a/user_guide_src/source/changelogs/v4.5.0.rst
+++ b/user_guide_src/source/changelogs/v4.5.0.rst
@@ -24,9 +24,17 @@ Behavior Changes
 Interface Changes
 =================
 
+.. _v450-method-signature-changes:
+
 Method Signature Changes
 ========================
 
+Return Type Changes
+-------------------
+
+- **Model:** The return type of the ``objectToRawArray()`` method in the ``Model``
+  and ``BaseModel`` classes has been changed to ``array``.
+
 .. _v450-removed-deprecated-items:
 
 Removed Deprecated Items
diff --git a/user_guide_src/source/installation/upgrade_450.rst b/user_guide_src/source/installation/upgrade_450.rst
index a9925320bf2d..74fcf24a9e0e 100644
--- a/user_guide_src/source/installation/upgrade_450.rst
+++ b/user_guide_src/source/installation/upgrade_450.rst
@@ -18,11 +18,18 @@ Mandatory File Changes
 Breaking Changes
 ****************
 
+Method Signature Changes
+========================
+
+Some method signature changes have been made. Classes that extend them should
+update their APIs to reflect the changes. See :ref:`ChangeLog <v450-method-signature-changes>`
+for details.
+
 Removed Deprecated Items
 ========================
 
 Some deprecated items have been removed. If you extend these classes and are
-using them, upgrade your code. See :ref:`v450-removed-deprecated-items` for details.
+using them, upgrade your code. See :ref:`ChangeLog <v450-removed-deprecated-items>` for details.
 
 Breaking Enhancements
 *********************