diff --git a/doc/sphinx/cython/thermo.rst b/doc/sphinx/cython/thermo.rst
index d2d6f7030..973b36ecb 100644
--- a/doc/sphinx/cython/thermo.rst
+++ b/doc/sphinx/cython/thermo.rst
@@ -8,3 +8,4 @@ These classes are used to describe the thermodynamic state of a system.
 .. autoclass:: ThermoPhase
 .. autoclass:: InterfacePhase
 .. autoclass:: PureFluid
+.. autoclass:: Mixture