diff --git a/doc/Doxyfile.in b/doc/Doxyfile.in
index cfc15a0f9..058c88b97 100644
--- a/doc/Doxyfile.in
+++ b/doc/Doxyfile.in
@@ -216,7 +216,7 @@ ALIASES                = "only_for_vectors=This is only for vectors (either row-
                          "lu_module=This is defined in the %LU module. \code #include <Eigen/LU> \endcode" \
                          "qr_module=This is defined in the %QR module. \code #include <Eigen/QR> \endcode" \
                          "svd_module=This is defined in the %SVD module. \code #include <Eigen/SVD> \endcode" \
-                         "specialfunctions_module=This is defined in the SpecialFunctions module. \code #include <Eigen/SpecialFunctions> \endcode" \
+                         "specialfunctions_module=This is defined in the \b unsupported SpecialFunctions module. \code #include <Eigen/SpecialFunctions> \endcode" \
                          "label=\bug" \
                          "matrixworld=<a href='#matrixonly' style='color:green;text-decoration: none;'>*</a>" \
                          "arrayworld=<a href='#arrayonly' style='color:blue;text-decoration: none;'>*</a>" \