diff --git a/singularity-opac/photons/zhu_grey_table_opacity_photons.hpp b/singularity-opac/photons/zhu_grey_table_opacity_photons.hpp
index 3afc81f..db05cc5 100644
--- a/singularity-opac/photons/zhu_grey_table_opacity_photons.hpp
+++ b/singularity-opac/photons/zhu_grey_table_opacity_photons.hpp
@@ -43,7 +43,7 @@ class ZhuTableOpacity {
 
   ZhuTableOpacity() = default;
 
-  // construct Planck/Rosseland DataBox from Zhu ascii file
+  // construct Planck/Rosseland DataBox from Zhu ascii or spiner hdf5 file
   ZhuTableOpacity(const std::string filename, const bool use_planck_absorb = false)
     : opac_type_(use_planck_absorb) {