diff --git a/docs/source_docs/user_guide/inputs/species_defs.rst b/docs/source_docs/user_guide/inputs/species_defs.rst
index 1a600141c8cd2aa0c7d722abf1a53abb6a387481..2d79e27e3c2e7886f04252425c3c3543961e5eaf 100644
--- a/docs/source_docs/user_guide/inputs/species_defs.rst
+++ b/docs/source_docs/user_guide/inputs/species_defs.rst
@@ -188,9 +188,6 @@ outflow boundary condition pressure which is set here to 1 atmosphere.
    species.diffusivity = constant
    species.diffusivity.constant  = 1.9e-5
 
-   species.O2.molecular_weight = 31.99880e-3
-   species.N2.molecular_weight = 28.01340e-3
-
    species.specific_heat = NASA7-poly
 
    # Oxygen