diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index 66b3e1e251..073bcefd31 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -6846,6 +6846,18 @@ system and gives an overview of their function and contents.
 
          EXTRA_IMAGE_FEATURES += "read-only-rootfs"
 
+   :term:`SETUPTOOLS_BUILD_ARGS`
+      When used by recipes that inherit the
+      :ref:`setuptools3 <ref-classes-setuptools3>` class, this variable can
+      be used to specify additional arguments to be passed to ``setup.py build``
+      in the ``setuptools3_do_compile()`` task.
+
+   :term:`SETUPTOOLS_INSTALL_ARGS`
+      When used by recipes that inherit the
+      :ref:`setuptools3 <ref-classes-setuptools3>` class, this variable can
+      be used to specify additional arguments to be passed to ``setup.py install``
+      in the ``setuptools3_do_install()`` task.
+
    :term:`SETUPTOOLS_SETUP_PATH`
       When used by recipes that inherit the
       :ref:`setuptools3 <ref-classes-setuptools3>` class, this variable should