diff --git a/docs/source_docs/user_guide/inputs/output/plotting.rst b/docs/source_docs/user_guide/inputs/output/plotting.rst
index a9eb67401d3bdcac52d2e6e15e1a2f5c17c3530e..02fbe6f3863e0cc4c79a2118c5fa9e64fc4856b7 100644
--- a/docs/source_docs/user_guide/inputs/output/plotting.rst
+++ b/docs/source_docs/user_guide/inputs/output/plotting.rst
@@ -53,6 +53,8 @@ The following inputs must be preceded by the prefix ``mfix`` and control which v
 +---------------------+-----------------------------------------------------------------------+-------------+-----------+
 | plt_radius          | Plot particle radius.                                                 |    Int      | 0         |
 +---------------------+-----------------------------------------------------------------------+-------------+-----------+
+| plt_rte_G           | Plot radiation intensity.                                             |    Int      | 0         |
++---------------------+-----------------------------------------------------------------------+-------------+-----------+
 | plt_ro_g            | Plot fluid density.                                                   |    Int      | 0         |
 +---------------------+-----------------------------------------------------------------------+-------------+-----------+
 | plt_ro_p            | Plot particle density.                                                |    Int      | 0         |
diff --git a/docs/source_docs/user_guide/inputs/radiation_model.rst b/docs/source_docs/user_guide/inputs/radiation_model.rst
index 92d051b044da172185b5fa5f75f77689cc549153..1228c39658a715feaccc8bf781c46f5618abb068 100644
--- a/docs/source_docs/user_guide/inputs/radiation_model.rst
+++ b/docs/source_docs/user_guide/inputs/radiation_model.rst
@@ -23,9 +23,15 @@ The following inputs are defined using the prefix ``radiation``:
 | update_int           | Solve for the radiation intensity on the interval in time steps.         | Int      | None    |
 |                      | This input cannot be specified with ``radiation.update_per_approx``.     |          |         |
 +----------------------+--------------------------------------------------------------------------+----------+---------+
-| update_per_approx    | Solve for the radiation intensity on the approximted lapsed time.        | Int      | None    |
+| update_per_approx    | Solve for the radiation intensity on the approximated lapsed time.       | Int      | None    |
 |                      | This input cannot be specified with ``radiation.update_int``.            |          |         |
 +----------------------+--------------------------------------------------------------------------+----------+---------+
+| domain.is_black      | Override domain radiation boundary conditions with black surfaces:       | Ints<3>  | 0       |
+|                      | boundary temperature is set to 0 K and emissivity is set to 1.           |          |         |
+|                      | This is an advanced setting and should be used with caution because it   |          |         |
+|                      | makes the radiation boundary conditions differ from the flow boundary    |          |         |
+|                      | conditions.                                                              |          |         |
++----------------------+--------------------------------------------------------------------------+----------+---------+
 
 RTE P\ :sub:`1` solver
 ----------------------