diff --git a/docs/source_docs/user_guide/inputs/output/plotfiles.rst b/docs/source_docs/user_guide/inputs/output/plotfiles.rst
index 83c0d0585099cb8b01e26e6aeb980a10e19d7147..18ddc4f946e146294165864c6a2a5f7a6c7fe0db 100644
--- a/docs/source_docs/user_guide/inputs/output/plotfiles.rst
+++ b/docs/source_docs/user_guide/inputs/output/plotfiles.rst
@@ -51,7 +51,9 @@ 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         |
 +---------------------+-----------------------------------------------------------------------+-------------+-----------+