diff --git a/src/ol/attribution.js b/src/ol/attribution.js
index bb24b553ef..b8d4aac9d7 100644
--- a/src/ol/attribution.js
+++ b/src/ol/attribution.js
@@ -45,6 +45,7 @@ ol.Attribution = function(options) {
 
 /**
  * @return {string} HTML.
+ * @api
  */
 ol.Attribution.prototype.getHTML = function() {
   return this.html_;
diff --git a/src/ol/layer/layergroup.js b/src/ol/layer/layergroup.js
index eb8ffb8c97..b89e46435f 100644
--- a/src/ol/layer/layergroup.js
+++ b/src/ol/layer/layergroup.js
@@ -148,6 +148,7 @@ ol.layer.Group.prototype.handleLayersRemove_ = function(collectionEvent) {
  * @return {ol.Collection.<ol.layer.Base>|undefined} Collection of
  * {@link ol.layer.Layer layers} that are part of this group.
  * @observable
+ * @api
  */
 ol.layer.Group.prototype.getLayers = function() {
   return /** @type {ol.Collection.<ol.layer.Base>|undefined} */ (this.get(
@@ -163,6 +164,7 @@ goog.exportProperty(
  * @param {ol.Collection.<ol.layer.Base>|undefined} layers Collection of
  * {@link ol.layer.Layer layers} that are part of this group.
  * @observable
+ * @api
  */
 ol.layer.Group.prototype.setLayers = function(layers) {
   this.set(ol.layer.GroupProperty.LAYERS, layers);
diff --git a/src/ol/source/source.js b/src/ol/source/source.js
index 591b45730f..8e09df215d 100644
--- a/src/ol/source/source.js
+++ b/src/ol/source/source.js
@@ -91,6 +91,7 @@ ol.source.Source.prototype.forEachFeatureAtPixel =
 
 /**
  * @return {Array.<ol.Attribution>} Attributions.
+ * @api
  */
 ol.source.Source.prototype.getAttributions = function() {
   return this.attributions_;
@@ -99,6 +100,7 @@ ol.source.Source.prototype.getAttributions = function() {
 
 /**
  * @return {string|olx.LogoOptions|undefined} Logo.
+ * @api
  */
 ol.source.Source.prototype.getLogo = function() {
   return this.logo_;
@@ -107,6 +109,7 @@ ol.source.Source.prototype.getLogo = function() {
 
 /**
  * @return {ol.proj.Projection} Projection.
+ * @api
  */
 ol.source.Source.prototype.getProjection = function() {
   return this.projection_;
diff --git a/src/ol/tilegrid/tilegrid.js b/src/ol/tilegrid/tilegrid.js
index 8c553e8f17..8996b786d2 100644
--- a/src/ol/tilegrid/tilegrid.js
+++ b/src/ol/tilegrid/tilegrid.js
@@ -133,6 +133,7 @@ ol.tilegrid.TileGrid.prototype.forEachTileCoordParentTileRange =
 
 /**
  * @return {number} Max zoom.
+ * @api
  */
 ol.tilegrid.TileGrid.prototype.getMaxZoom = function() {
   return this.maxZoom;