diff --git a/src/Magnum/Trade/PhongMaterialData.h b/src/Magnum/Trade/PhongMaterialData.h
index 2f5b29bdf..851ab7961 100644
--- a/src/Magnum/Trade/PhongMaterialData.h
+++ b/src/Magnum/Trade/PhongMaterialData.h
@@ -163,6 +163,9 @@ class MAGNUM_TRADE_EXPORT PhongMaterialData: public AbstractMaterialData {
          * @param importerState         Importer-specific state
          * @m_since_latest
          *
+         * If any `*CoordinateSet` is non-zero, expects 
+         * @ref Flag::TextureCoordinateSets to be enabled as well.
+         *
          * If any `*CoordinateSet` is non-zero, expects
          * @ref Flag::TextureCoordinateSets to be enabled as well.
          *