diff --git a/user_guide_src/source/changelogs/v4.3.2.rst b/user_guide_src/source/changelogs/v4.3.2.rst
index 9249f86fdb5d..fbb4e016ae63 100644
--- a/user_guide_src/source/changelogs/v4.3.2.rst
+++ b/user_guide_src/source/changelogs/v4.3.2.rst
@@ -12,6 +12,17 @@ Release Date: Unreleased
 BREAKING
 ********
 
+Behavior Changes
+================
+
+base_url()
+----------
+
+Due to a bug, in previous versions :php:func:`base_url()` without argument returned baseURL
+without a trailing slash (``/``) like ``http://localhost:8080``. Now it returns
+baseURL with a trailing slash. This is the same behavior as ``base_url()`` in
+CodeIgniter 3.
+
 Message Changes
 ***************
 
diff --git a/user_guide_src/source/helpers/url_helper.rst b/user_guide_src/source/helpers/url_helper.rst
index 1b17159bbe4a..389b83c3ef62 100644
--- a/user_guide_src/source/helpers/url_helper.rst
+++ b/user_guide_src/source/helpers/url_helper.rst
@@ -64,6 +64,10 @@ The following functions are available:
     .. note:: Since v4.3.0, if you set ``Config\App::$allowedHostnames``,
         this returns the URL with the hostname set in it if the current URL matches.
 
+    .. note:: In previous versions, this returned the base URL without a trailing
+        slash (``/``) when called with no argument. The bug was fixed and
+        since v4.3.2 it returns the base URL with a trailing slash.
+
     Returns your site base URL, as specified in your config file. Example:
 
     .. literalinclude:: url_helper/003.php
diff --git a/user_guide_src/source/installation/upgrade_432.rst b/user_guide_src/source/installation/upgrade_432.rst
new file mode 100644
index 000000000000..f61e57012d6a
--- /dev/null
+++ b/user_guide_src/source/installation/upgrade_432.rst
@@ -0,0 +1,56 @@
+##############################
+Upgrading from 4.3.1 to 4.3.2
+##############################
+
+Please refer to the upgrade instructions corresponding to your installation method.
+
+- :ref:`Composer Installation App Starter Upgrading <app-starter-upgrading>`
+- :ref:`Composer Installation Adding CodeIgniter4 to an Existing Project Upgrading <adding-codeigniter4-upgrading>`
+- :ref:`Manual Installation Upgrading <installing-manual-upgrading>`
+
+.. contents::
+    :local:
+    :depth: 2
+
+Breaking Changes
+****************
+
+base_url()
+==========
+
+The :php:func:`base_url()` behavior has been fix. In previous versions, when you
+call ``base_url()`` **without argument**, it returned baseURL without a trailing
+slash (``/``). Now it returns baseURL with a trailing slash. For example:
+
+- before: ``http://example.com``
+- after: ``http://example.com/``
+
+If you have code to call ``base_url()`` without argument, you may need to adjust the URLs.
+
+Project Files
+*************
+
+Some files in the **project space** (root, app, public, writable) received updates. Due to
+these files being outside of the **system** scope they will not be changed without your intervention.
+
+There are some third-party CodeIgniter modules available to assist with merging changes to
+the project space: `Explore on Packagist <https://packagist.org/explore/?query=codeigniter4%20updates>`_.
+
+Content Changes
+===============
+
+The following files received significant changes (including deprecations or visual adjustments)
+and it is recommended that you merge the updated versions with your application:
+
+Config
+------
+
+- @TODO
+
+All Changes
+===========
+
+This is a list of all files in the **project space** that received changes;
+many will be simple comments or formatting that have no effect on the runtime:
+
+- @TODO
diff --git a/user_guide_src/source/installation/upgrading.rst b/user_guide_src/source/installation/upgrading.rst
index f5600aa52d00..d754d020b55c 100644
--- a/user_guide_src/source/installation/upgrading.rst
+++ b/user_guide_src/source/installation/upgrading.rst
@@ -16,6 +16,7 @@ See also :doc:`./backward_compatibility_notes`.
 
     backward_compatibility_notes
 
+    upgrade_432
     upgrade_431
     upgrade_430
     upgrade_4212