diff --git a/build.py b/build.py
index f84f339c7d..8621391bec 100755
--- a/build.py
+++ b/build.py
@@ -373,7 +373,7 @@ virtual('lint', 'build/lint-timestamp', 'build/lint-generated-timestamp',
 def build_lint_src_timestamp(t):
     t.run('%(GJSLINT)s',
           '--jslint_error=all',
-          '--custom_jsdoc_tags=todo',
+          '--custom_jsdoc_tags=todo,function',
           '--strict',
           t.newer(t.dependencies))
     t.touch()
diff --git a/src/ol/format/featureformat.js b/src/ol/format/featureformat.js
index 62d7b4b4ad..06b3c4f12e 100644
--- a/src/ol/format/featureformat.js
+++ b/src/ol/format/featureformat.js
@@ -5,6 +5,10 @@ goog.require('goog.functions');
 
 
 /**
+ * ol.format.Feature subclasses provide the ability to decode and encode
+ * {@link ol.Feature} objects from a variety of commonly used geospatial
+ * file formats.  See the documentation for each format for more details.
+ *
  * @constructor
  */
 ol.format.Feature = function() {
@@ -24,6 +28,8 @@ ol.format.Feature.prototype.getType = goog.abstractMethod;
 
 
 /**
+ * Read a single feature from a source.
+ *
  * @param {ArrayBuffer|Document|Node|Object|string} source Source.
  * @return {ol.Feature} Feature.
  */
@@ -31,6 +37,8 @@ ol.format.Feature.prototype.readFeature = goog.abstractMethod;
 
 
 /**
+ * Read all features from a source.
+ *
  * @param {ArrayBuffer|Document|Node|Object|string} source Source.
  * @return {Array.<ol.Feature>} Features.
  */
@@ -38,6 +46,8 @@ ol.format.Feature.prototype.readFeatures = goog.abstractMethod;
 
 
 /**
+ * Read a single geometry from a source.
+ *
  * @param {ArrayBuffer|Document|Node|Object|string} source Source.
  * @return {ol.geom.Geometry} Geometry.
  */
@@ -45,6 +55,8 @@ ol.format.Feature.prototype.readGeometry = goog.abstractMethod;
 
 
 /**
+ * Read the projection from a source.
+ *
  * @param {ArrayBuffer|Document|Node|Object|string} source Source.
  * @return {ol.proj.Projection} Projection.
  */
@@ -52,6 +64,8 @@ ol.format.Feature.prototype.readProjection = goog.abstractMethod;
 
 
 /**
+ * Encode a feature in this format.
+ *
  * @param {ol.Feature} feature Feature.
  * @return {ArrayBuffer|Node|Object|string} Result.
  */
@@ -59,6 +73,8 @@ ol.format.Feature.prototype.writeFeature = goog.abstractMethod;
 
 
 /**
+ * Encode an array of features in this format.
+ *
  * @param {Array.<ol.Feature>} features Features.
  * @return {ArrayBuffer|Node|Object|string} Result.
  */
@@ -66,6 +82,8 @@ ol.format.Feature.prototype.writeFeatures = goog.abstractMethod;
 
 
 /**
+ * Write a single geometry in this format.
+ *
  * @param {ol.geom.Geometry} geometry Geometry.
  * @return {ArrayBuffer|Node|Object|string} Node.
  */
diff --git a/src/ol/format/geojsonformat.js b/src/ol/format/geojsonformat.js
index 903affd392..a9e53bc413 100644
--- a/src/ol/format/geojsonformat.js
+++ b/src/ol/format/geojsonformat.js
@@ -21,6 +21,8 @@ goog.require('ol.proj');
 
 
 /**
+ * Provide access to features stored in the GeoJSON format.
+ *
  * @constructor
  * @extends {ol.format.JSONFeature}
  * @param {olx.format.GeoJSONOptions=} opt_options Options.
@@ -313,6 +315,28 @@ ol.format.GeoJSON.prototype.getExtensions = function() {
 };
 
 
+/**
+ * Read a feature from a GeoJSON Feature source.  This method will throw
+ * an error if used with a FeatureCollection source.
+ *
+ * @function
+ * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+ * @return {ol.Feature} Feature.
+ */
+ol.format.GeoJSON.prototype.readFeature;
+
+
+/**
+ * Read all features from a GeoJSON source.  Works with both Feature and
+ * FeatureCollection sources.
+ *
+ * @function
+ * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+ * @return {Array.<ol.Feature>} Features.
+ */
+ol.format.GeoJSON.prototype.readFeatures;
+
+
 /**
  * @inheritDoc
  */
@@ -356,6 +380,16 @@ ol.format.GeoJSON.prototype.readFeaturesFromObject = function(object) {
 };
 
 
+/**
+ * Read a geometry from a GeoJSON source.
+ *
+ * @function
+ * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+ * @return {ol.geom.Geometry} Geometry.
+ */
+ol.format.GeoJSON.prototype.readGeometry;
+
+
 /**
  * @inheritDoc
  */
@@ -366,7 +400,10 @@ ol.format.GeoJSON.prototype.readGeometryFromObject = function(object) {
 
 
 /**
- * @inheritDoc
+ * Read the projection from the GeoJSON source file.
+ *
+ * @param {ArrayBuffer|Document|Node|Object|string} object Source.
+ * @return {ol.proj.Projection} Projection.
  */
 ol.format.GeoJSON.prototype.readProjection = function(object) {
   var geoJSONObject = /** @type {GeoJSONObject} */ (object);
@@ -390,6 +427,16 @@ ol.format.GeoJSON.prototype.readProjection = function(object) {
 };
 
 
+/**
+ * Encode a feature as a GeoJSON Feature object.
+ *
+ * @function
+ * @param {ol.Feature} feature Feature.
+ * @return {ArrayBuffer|Node|Object|string} Result.
+ */
+ol.format.GeoJSON.prototype.writeFeature;
+
+
 /**
  * @inheritDoc
  */
@@ -415,6 +462,16 @@ ol.format.GeoJSON.prototype.writeFeatureObject = function(feature) {
 };
 
 
+/**
+ * Encode an array of features as GeoJSON.
+ *
+ * @function
+ * @param {Array.<ol.Feature>} features Features.
+ * @return {ArrayBuffer|Node|Object|string} Result.
+ */
+ol.format.GeoJSON.prototype.writeFeatures;
+
+
 /**
  * @inheritDoc
  */
diff --git a/src/ol/format/gpxformat.exports b/src/ol/format/gpxformat.exports
index 82582fd4ac..ac072e55dd 100644
--- a/src/ol/format/gpxformat.exports
+++ b/src/ol/format/gpxformat.exports
@@ -1,3 +1,5 @@
 @exportSymbol ol.format.GPX
 @exportProperty ol.format.GPX.prototype.readFeature
 @exportProperty ol.format.GPX.prototype.readFeatures
+@exportProperty ol.format.GPX.prototype.readProjection
+@exportProperty ol.format.GPX.prototype.writeFeatures
diff --git a/src/ol/format/gpxformat.js b/src/ol/format/gpxformat.js
index 9217c15719..8dbe7cdba8 100644
--- a/src/ol/format/gpxformat.js
+++ b/src/ol/format/gpxformat.js
@@ -363,6 +363,16 @@ ol.format.GPX.WPT_PARSERS_ = ol.xml.makeParsersNS(
     });
 
 
+/**
+ * Read the first feature from a GPX source.
+ *
+ * @function
+ * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+ * @return {ol.Feature} Feature.
+ */
+ol.format.GPX.prototype.readFeature;
+
+
 /**
  * @inheritDoc
  */
@@ -384,6 +394,16 @@ ol.format.GPX.prototype.readFeatureFromNode = function(node) {
 };
 
 
+/**
+ * Read all features from a GPX source.
+ *
+ * @function
+ * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+ * @return {Array.<ol.Feature>} Features.
+ */
+ol.format.GPX.prototype.readFeatures;
+
+
 /**
  * @inheritDoc
  */
@@ -407,6 +427,15 @@ ol.format.GPX.prototype.readFeaturesFromNode = function(node) {
 };
 
 
+/**
+ * Read the projection from a GPX source.
+ *
+ * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+ * @return {ol.proj.Projection} Projection.
+ */
+ol.format.GPX.prototype.readProjection;
+
+
 /**
  * @inheritDoc
  */
@@ -770,6 +799,16 @@ ol.format.GPX.V1_1 = function() {
 goog.inherits(ol.format.GPX.V1_1, ol.format.GPX);
 
 
+/**
+ * Encode an array of features in the GPX format.
+ *
+ * @function
+ * @param {Array.<ol.Feature>} features Features.
+ * @return {ArrayBuffer|Node|Object|string} Result.
+ */
+ol.format.GPX.prototype.writeFeatures;
+
+
 /**
  * @inheritDoc
  */
diff --git a/src/ol/format/igcformat.exports b/src/ol/format/igcformat.exports
index f5faa5c4fb..6a6acf7e15 100644
--- a/src/ol/format/igcformat.exports
+++ b/src/ol/format/igcformat.exports
@@ -1,3 +1,4 @@
 @exportSymbol ol.format.IGC
 @exportProperty ol.format.IGC.prototype.readFeature
 @exportProperty ol.format.IGC.prototype.readFeatures
+@exportProperty ol.format.IGC.prototype.readProjection
diff --git a/src/ol/format/igcformat.js b/src/ol/format/igcformat.js
index 449abe3e39..8be575dd04 100644
--- a/src/ol/format/igcformat.js
+++ b/src/ol/format/igcformat.js
@@ -85,6 +85,16 @@ ol.format.IGC.prototype.getExtensions = function() {
 };
 
 
+/**
+ * Read the feature from the IGC source.
+ *
+ * @function
+ * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+ * @return {ol.Feature} Feature.
+ */
+ol.format.IGC.prototype.readFeature;
+
+
 /**
  * @inheritDoc
  */
@@ -156,6 +166,17 @@ ol.format.IGC.prototype.readFeatureFromText = function(text) {
 };
 
 
+/**
+ * Read the feature from the source. As IGC sources contain a single
+ * feature, this will return the feature in an array.
+ *
+ * @function
+ * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+ * @return {Array.<ol.Feature>} Features.
+ */
+ol.format.IGC.prototype.readFeatures;
+
+
 /**
  * @inheritDoc
  */
@@ -169,6 +190,16 @@ ol.format.IGC.prototype.readFeaturesFromText = function(text) {
 };
 
 
+/**
+ * Read the projection from the IGC source.
+ *
+ * @function
+ * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+ * @return {ol.proj.Projection} Projection.
+ */
+ol.format.IGC.prototype.readProjection;
+
+
 /**
  * @inheritDoc
  */
diff --git a/src/ol/format/kmlformat.exports b/src/ol/format/kmlformat.exports
index 72929f6fd4..edafad12f2 100644
--- a/src/ol/format/kmlformat.exports
+++ b/src/ol/format/kmlformat.exports
@@ -1,6 +1,5 @@
 @exportSymbol ol.format.KML
 @exportProperty ol.format.KML.prototype.readFeature
 @exportProperty ol.format.KML.prototype.readFeatures
-@exportProperty ol.format.KML.prototype.readGeometry
 @exportProperty ol.format.KML.prototype.readName
 @exportProperty ol.format.KML.prototype.readProjection
diff --git a/src/ol/format/kmlformat.js b/src/ol/format/kmlformat.js
index 7088973182..6e049f3416 100644
--- a/src/ol/format/kmlformat.js
+++ b/src/ol/format/kmlformat.js
@@ -1443,6 +1443,16 @@ ol.format.KML.prototype.readSharedStyleMap_ = function(node, objectStack) {
 };
 
 
+/**
+ * Read the first feature from a KML source.
+ *
+ * @function
+ * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+ * @return {ol.Feature} Feature.
+ */
+ol.format.KML.prototype.readFeature;
+
+
 /**
  * @inheritDoc
  */
@@ -1462,6 +1472,16 @@ ol.format.KML.prototype.readFeatureFromNode = function(node) {
 };
 
 
+/**
+ * Read all features from a KML source.
+ *
+ * @function
+ * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+ * @return {Array.<ol.Feature>} Features.
+ */
+ol.format.KML.prototype.readFeatures;
+
+
 /**
  * @inheritDoc
  */
@@ -1573,6 +1593,16 @@ ol.format.KML.prototype.readNameFromNode = function(node) {
 };
 
 
+/**
+ * Read the projection from a KML source.
+ *
+ * @function
+ * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+ * @return {ol.proj.Projection} Projection.
+ */
+ol.format.KML.prototype.readProjection;
+
+
 /**
  * @inheritDoc
  */
diff --git a/src/ol/format/topojsonformat.js b/src/ol/format/topojsonformat.js
index 3095cf7078..3af47c2f5c 100644
--- a/src/ol/format/topojsonformat.js
+++ b/src/ol/format/topojsonformat.js
@@ -264,6 +264,16 @@ ol.format.TopoJSON.readFeatureFromGeometry_ = function(object, arcs,
 };
 
 
+/**
+ * Read all features from a TopoJSON source.
+ *
+ * @function
+ * @param {ArrayBuffer|Document|Node|Object|string} source Source.
+ * @return {Array.<ol.Feature>} Features.
+ */
+ol.format.TopoJSON.prototype.readFeatures;
+
+
 /**
  * @inheritDoc
  */
@@ -364,7 +374,11 @@ ol.format.TopoJSON.transformVertex_ = function(vertex, scale, translate) {
 
 
 /**
- * @inheritDoc
+ * Read the projection from a TopoJSON source.
+ *
+ * @function
+ * @param {ArrayBuffer|Document|Node|Object|string} object Source.
+ * @return {ol.proj.Projection} Projection.
  */
 ol.format.TopoJSON.prototype.readProjection = function(object) {
   return this.defaultProjection_;