diff --git a/doc/Doxyfile b/doc/Doxyfile
index ea1f071..afacc9b 100644
--- a/doc/Doxyfile
+++ b/doc/Doxyfile
@@ -1847,7 +1847,7 @@ FORMULA_FONTSIZE       = 10
 # to create new LaTeX commands to be used in formulas as building blocks. See
 # the section "Including formulas" for details.
 
-FORMULA_MACROFILE      =
+FORMULA_MACROFILE      = doc/macros.tex
 
 # Enable the USE_MATHJAX option to render LaTeX formulas using MathJax (see
 # https://www.mathjax.org) which uses client side JavaScript for the rendering
@@ -1858,7 +1858,7 @@ FORMULA_MACROFILE      =
 # The default value is: NO.
 # This tag requires that the tag GENERATE_HTML is set to YES.
 
-USE_MATHJAX            = NO
+USE_MATHJAX            = YES
 
 # With MATHJAX_VERSION it is possible to specify the MathJax version to be used.
 # Note that the different versions of MathJax have different requirements with
diff --git a/include/teqpflsh/properties/interfaces.hpp b/include/teqpflsh/properties/interfaces.hpp
index f07515e..b477f6f 100644
--- a/include/teqpflsh/properties/interfaces.hpp
+++ b/include/teqpflsh/properties/interfaces.hpp
@@ -15,7 +15,7 @@ using namespace teqp::cppinterface;
 \f[
 \Lambda_{ij} = \varpi^i\rho^j\deriv{^{i+j}(\alpha)}{\varpi^i\partial\rho^j}{}
 \f]
- with \f$\varphi=1/T\f$
+ with \f$\varpi=1/T\f$
 */
 class HelmholtzInterface{
 public: