diff --git a/docs/source/InputsProblemDefinition.rst b/docs/source/InputsProblemDefinition.rst
index 66fef77f7509f2028d3723a9da8ef34640e100d7..2bc7dee9c86d34996b537bdc1c3889f6b64b363e 100644
--- a/docs/source/InputsProblemDefinition.rst
+++ b/docs/source/InputsProblemDefinition.rst
@@ -34,6 +34,8 @@ The following inputs must be preceded by "mfix."
 +----------------------+-------------------------------------------------------------------------+----------+-----------+
 | levelset__refinement | Refinement factor of levelset resolution relative to level 0 resolution |   Int    | 1         |
 +----------------------+-------------------------------------------------------------------------+----------+-----------+
+| po_no_par_out        | Let particles exit (default) or bounce-back at pressure outflows        |   Int    | 0         |
++----------------------+-------------------------------------------------------------------------+----------+-----------+
 
 Setting basic EB walls can be specified by inputs preceded by "xlo", "xhi", "ylo", "yhi", "zlo", and "zhi"