diff --git a/docs/source/techniques/ISISPowder-Polaris-v1.rst b/docs/source/techniques/ISISPowder-Polaris-v1.rst
index b2fd8f3728b4323895a774a2c66ff38f75749d13..b31126f55a515e7b256b57b36db6ef9f0ba954b3 100644
--- a/docs/source/techniques/ISISPowder-Polaris-v1.rst
+++ b/docs/source/techniques/ISISPowder-Polaris-v1.rst
@@ -117,6 +117,7 @@ above:
 The following parameters may also be optionally set:
 
 - :ref:`file_ext_polaris_isis-powder-diffraction-ref`
+- :ref:`sample_empty_polaris_isis_powder-diffraction-ref`
 - :ref:`suffix_polaris_isis-powder-diffraction-ref`