diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index 591c03028c..83c055fe5d 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -10914,6 +10914,22 @@ system and gives an overview of their function and contents.
       `Unified Kernel Image (UKI) <https://uapi-group.org/specifications/specs/unified_kernel_image/>`__.
       Defaults to ``ukify build``.
 
+   :term:`UNINATIVE_CHECKSUM`
+      When inheriting the :ref:`ref-classes-uninative` class, the
+      :term:`UNINATIVE_CHECKSUM` variable flags contain the checksums of the
+      uninative tarball as specified by the :term:`UNINATIVE_URL` variable.
+      There should be one checksum per tarballs published at
+      :term:`UNINATIVE_URL`, which match architectures. For example::
+
+         UNINATIVE_CHECKSUM[aarch64] ?= "812045d826b7fda88944055e8526b95a5a9440bfef608d5b53fd52faab49bf85"
+         UNINATIVE_CHECKSUM[i686] ?= "5cc28efd0c15a75de4bcb147c6cce65f1c1c9d442173a220f08427f40a3ffa09"
+         UNINATIVE_CHECKSUM[x86_64] ?= "4c03d1ed2b7b4e823aca4a1a23d8f2e322f1770fc10e859adcede5777aff4f3a"
+
+   :term:`UNINATIVE_URL`
+      When inheriting the :ref:`ref-classes-uninative` class, the
+      :term:`UNINATIVE_URL` variable contains the URL where the uninative
+      tarballs are published.
+
    :term:`UNKNOWN_CONFIGURE_OPT_IGNORE`
       Specifies a list of options that, if reported by the configure script
       as being invalid, should not generate a warning during the