diff --git a/docs/source_docs/user_guide/inputs/species_defs.rst b/docs/source_docs/user_guide/inputs/species_defs.rst
index 4032718a1252ad17df309044556f0ab064f6cee8..48a662c39e2ba38f375baa8869d3c3995b1b9073 100644
--- a/docs/source_docs/user_guide/inputs/species_defs.rst
+++ b/docs/source_docs/user_guide/inputs/species_defs.rst
@@ -120,8 +120,8 @@ local species concentrations do not affect the fluid.
    # -----------------------------------------------------------------------
    fluid.solve = fluid
 
-   fluid.viscosity          = constant
-   fluid.viscosity.constant = 2.0e-5
+   fluid.viscosity.molecular = constant
+   fluid.viscosity.molecular.constant = 2.0e-5
 
    fluid.species =  N2  O2
 
@@ -216,8 +216,8 @@ outflow boundary condition pressure which is set here to 1 atmosphere.
    # -----------------------------------------------------------------------
    fluid.solve = fluid
 
-   fluid.viscosity          = constant
-   fluid.viscosity.constant = 2.0e-5
+   fluid.viscosity.molecular = constant
+   fluid.viscosity.molecular.constant = 2.0e-5
 
    fluid.thermal_conductivity = constant
    fluid.thermal_conductivity.constant = 0.026