diff --git a/docs/source_docs/inputs/InputsDiscretization.rst b/docs/source_docs/inputs/InputsDiscretization.rst
index 3222b6d4a929f618d8d72bc1c2f85cd7eeb46262..5754dbdff0d960b39a9affe56a6919c945b3b79b 100644
--- a/docs/source_docs/inputs/InputsDiscretization.rst
+++ b/docs/source_docs/inputs/InputsDiscretization.rst
@@ -3,6 +3,8 @@
 Discretization
 ==============
 
+The following inputs must be preceded by "mfix."
+
 +---------------------------------+-----------------------------------------------------------------------+-------------+--------------+
 | Key                             | Description                                                           |   Type      | Default      |
 +=================================+=======================================================================+=============+==============+
@@ -19,6 +21,9 @@ Discretization
 +---------------------------------+-----------------------------------------------------------------------+-------------+--------------+
 | use_drag_in_godunov             | Include a drag term in the Godunov flux or (default) not              |   Bool      |  False       |
 +---------------------------------+-----------------------------------------------------------------------+-------------+--------------+
+| correction_small_volfrac        | Threshold volume fraction for correcting small cell velocity          |             |              |
+|                                 | at the end of the predictor and corrector                             |   Real      |  1.e-4       |
++---------------------------------+-----------------------------------------------------------------------+-------------+--------------+
 
 Notes: The code was originally developed with MOL and FluxRedist. Preliminary 
 tests show that the new single-step Godunov method is roughly twice as fast as