diff --git a/doc/sphinx/cython/migrating.rst b/doc/sphinx/cython/migrating.rst
index 1dd0896c5..c31d47c27 100644
--- a/doc/sphinx/cython/migrating.rst
+++ b/doc/sphinx/cython/migrating.rst
@@ -107,7 +107,7 @@ should be replaced with::
     >>> gas.P
     >>> gas.Y
 
-For pure fluid phases, the property `X` refers to the vapor mass fraction or "quality" of the phase. The following::
+For pure fluid phases, the property ``X`` refers to the vapor mass fraction or "quality" of the phase. The following::
 
     >>> w = Cantera.liquidvapor.Water()
     >>> w.set(T=400, Vapor=0.5)