diff --git a/src/ifcgeom/ifc_geom_api.h b/src/ifcgeom/ifc_geom_api.h
index 1d916a61d0..6427aad798 100644
--- a/src/ifcgeom/ifc_geom_api.h
+++ b/src/ifcgeom/ifc_geom_api.h
@@ -27,7 +27,7 @@
     #else
       #define IFC_GEOM_API __declspec(dllimport)
     #endif
-  #else // simply assume GCC-like
+  #else // simply assume *nix + GCC-like compiler
     #define IFC_GEOM_API __attribute__((visibility("default")))
   #endif
 #else
diff --git a/src/ifcparse/IfcParse_Export.h b/src/ifcparse/IfcParse_Export.h
index dd120aadeb..d853b9d301 100644
--- a/src/ifcparse/IfcParse_Export.h
+++ b/src/ifcparse/IfcParse_Export.h
@@ -27,7 +27,7 @@
     #else
       #define IfcParse_EXPORT __declspec(dllimport)
     #endif
-  #else // simply assume GCC-like
+  #else // simply assume *nix + GCC-like compiler
     #define IfcParse_EXPORT __attribute__((visibility("default")))
   #endif
 #else