diff --git a/src/ol/format/jsonfeatureformat.js b/src/ol/format/jsonfeatureformat.js
index 912c6f01c5..ae3a04be53 100644
--- a/src/ol/format/jsonfeatureformat.js
+++ b/src/ol/format/jsonfeatureformat.js
@@ -72,6 +72,8 @@ ol.format.JSONFeature.prototype.readFeatures = function(source) {
 
 /**
  * @param {Object} object Object.
+ * @param {ol.proj.ProjectionLike=} opt_targetProjection Target projection.
+ * @param {ol.proj.ProjectionLike=} opt_sourceProjection Source projection.
  * @protected
  * @return {ol.Feature} Feature.
  */
@@ -80,6 +82,8 @@ ol.format.JSONFeature.prototype.readFeatureFromObject = goog.abstractMethod;
 
 /**
  * @param {Object} object Object.
+ * @param {ol.proj.ProjectionLike=} opt_targetProjection Target projection.
+ * @param {ol.proj.ProjectionLike=} opt_sourceProjection Source projection.
  * @protected
  * @return {Array.<ol.Feature>} Features.
  */
@@ -96,6 +100,8 @@ ol.format.JSONFeature.prototype.readGeometry = function(source) {
 
 /**
  * @param {Object} object Object.
+ * @param {ol.proj.ProjectionLike=} opt_targetProjection Target projection.
+ * @param {ol.proj.ProjectionLike=} opt_sourceProjection Source projection.
  * @protected
  * @return {ol.geom.Geometry} Geometry.
  */