diff --git a/hub/changelog.rst b/hub/changelog.rst
index 13e0085184..e754653cad 100644
--- a/hub/changelog.rst
+++ b/hub/changelog.rst
@@ -1,6 +1,13 @@
 Changelog
 =========
 
+.. _changelog_2026-01-06:
+
+2026-01-06
+----------
+* Added the property ``include_internal_properties`` to the :ref:`merge source <merge_source>`.
+
+
 .. _changelog_2025-12-22:
 
 2025-12-22
diff --git a/hub/documentation/service-configuration/pipes/configuration-sources-merge.rst b/hub/documentation/service-configuration/pipes/configuration-sources-merge.rst
index 7cf13736ef..35d279cadd 100644
--- a/hub/documentation/service-configuration/pipes/configuration-sources-merge.rst
+++ b/hub/documentation/service-configuration/pipes/configuration-sources-merge.rst
@@ -221,6 +221,13 @@ Properties
      - ``"default"``
      - No
 
+   * - ``include_internal_properties``
+     - Boolean
+     - When using the ``list`` strategy, the ``$merged`` property does not contain internal properties such as ``_ts``
+       by default. This property can be set to ``true`` to include those properties.
+     - false
+     -
+
    * - ``max_merged``
      - Integer
      - Sets the maximum number of entities that can be merged at a time (not supported in version 1).