diff --git a/docs/source_docs/user_guide/inputs/output/plotfiles.rst b/docs/source_docs/user_guide/inputs/output/plotfiles.rst
index ed45e903c899f423d2458a27c45c639556d095f4..db4732bae80cd8227e992e3d5cc6d119061c1c5d 100644
--- a/docs/source_docs/user_guide/inputs/output/plotfiles.rst
+++ b/docs/source_docs/user_guide/inputs/output/plotfiles.rst
@@ -54,7 +54,9 @@ The following inputs must be preceded by "mfix." and control what variables will
 +---------------------+-----------------------------------------------------------------------+-------------+-----------+
 | plt_ro_g            | Save fluid density to plot file                                       |    Int      | 0         |
 +---------------------+-----------------------------------------------------------------------+-------------+-----------+
-| plt_mu_g            | Save fluid viscosity to plot file                                     |    Int      | 0         |
+| plt_mu_g            | Save fluid molecular viscosity to plot file                           |    Int      | 0         |
++---------------------+-----------------------------------------------------------------------+-------------+-----------+
+| plt_mu_g_eff        | Save fluid effective viscosity to plot file                           |    Int      | 0         |
 +---------------------+-----------------------------------------------------------------------+-------------+-----------+
 | plt_diveu           | Save div(ep_g . u) to plot file                                       |    Int      | 0         |
 +---------------------+-----------------------------------------------------------------------+-------------+-----------+