diff --git a/src/Magnum/Trade/AbstractMaterialData.h b/src/Magnum/Trade/AbstractMaterialData.h
index 1472165bd..47e89ce64 100644
--- a/src/Magnum/Trade/AbstractMaterialData.h
+++ b/src/Magnum/Trade/AbstractMaterialData.h
@@ -40,7 +40,7 @@ namespace Magnum { namespace Trade {
 @see @ref AbstractMaterialData::type()
 */
 enum class MaterialType: UnsignedByte {
-    Phong       /**< Phong shading */
+    Phong       /**< Phong shading (see @ref PhongMaterialData) */
 };
 
 /**
diff --git a/src/Magnum/Trade/ObjectData2D.h b/src/Magnum/Trade/ObjectData2D.h
index 896e7fff0..a95cf7f1d 100644
--- a/src/Magnum/Trade/ObjectData2D.h
+++ b/src/Magnum/Trade/ObjectData2D.h
@@ -110,8 +110,10 @@ class MAGNUM_EXPORT ObjectData2D {
 
         /**
          * @brief Instance ID
-         * @return ID of given camera / light / mesh etc., specified by
-         *      @ref instanceType()
+         *
+         * Returns ID of given camera / light / mesh etc., specified by
+         * @ref instanceType(). If @ref instanceType() is
+         * @ref ObjectInstanceType2D::Empty, this function returns `-1`.
          */
         Int instance() const { return _instance; }
 
diff --git a/src/Magnum/Trade/ObjectData3D.h b/src/Magnum/Trade/ObjectData3D.h
index b2aea9419..0bf7a3f1f 100644
--- a/src/Magnum/Trade/ObjectData3D.h
+++ b/src/Magnum/Trade/ObjectData3D.h
@@ -42,8 +42,8 @@ namespace Magnum { namespace Trade {
 @see @ref ObjectData3D::instanceType()
 */
 enum class ObjectInstanceType3D: UnsignedByte {
-    Camera,     /**< Camera instance (see CameraData) */
-    Light,      /**< Light instance (see LightData) */
+    Camera,     /**< Camera instance (see @ref CameraData) */
+    Light,      /**< Light instance (see @ref LightData) */
 
     /**
      * Mesh instance. The data can be cast to @ref MeshObjectData3D to provide
@@ -54,7 +54,6 @@ enum class ObjectInstanceType3D: UnsignedByte {
     Empty       /**< Empty */
 };
 
-
 /**
 @brief Three-dimensional object data