diff --git a/frontend-js/src/main/js/ServerConnector.js b/frontend-js/src/main/js/ServerConnector.js
index ac80202bbc29ca1bd36b8f0b880e6079a7a10851..68da0602930c2bd4d35f522bc9c412a2f11c773b 100644
--- a/frontend-js/src/main/js/ServerConnector.js
+++ b/frontend-js/src/main/js/ServerConnector.js
@@ -1265,7 +1265,7 @@ ServerConnector.getMaxSearchDistance = function () {
  *
  * @param {number} overlayId
  * @param {string} projectId
- * @returns {Bluebird<DataOverlay>}
+ * @returns {PromiseLike<DataOverlay>}
  */
 ServerConnector.getOverlayById = function (overlayId, projectId) {
   var self = this;
@@ -1398,6 +1398,16 @@ ServerConnector.getSessionData = function (project) {
   return this._sessionData;
 };
 
+/**
+ *
+ * @param {number} params.modelId
+ * @param {number} [params.projectId]
+ * @param {Point} params.coordinates
+ * @param {number} params.count
+ * @param {string} params.type
+ *
+ * @returns {PromiseLike<BioEntity[]>}
+ */
 ServerConnector.getClosestElementsByCoordinates = function (params) {
   var self = this;
   var queryParams = {
diff --git a/frontend-js/src/main/js/SessionData.js b/frontend-js/src/main/js/SessionData.js
index 6d0ff33bc806deca32d4f6fb0e714f9702bfb49a..3d3776a211ce0151e1beae29383c1daf55ff4f34 100644
--- a/frontend-js/src/main/js/SessionData.js
+++ b/frontend-js/src/main/js/SessionData.js
@@ -206,6 +206,12 @@ SessionData.prototype.getCenter = function(model) {
   return value;
 };
 
+/**
+ *
+ * @param {string} type
+ * @param {Array} [args]
+ * @returns {string}
+ */
 SessionData.prototype.getKey = function(type, args) {
   if (type === undefined) {
     throw new Error("Undefined type");
diff --git a/frontend-js/src/main/js/gui/leftPanel/GuiUtils.js b/frontend-js/src/main/js/gui/leftPanel/GuiUtils.js
index 41769be6cfdde24d9031ac1600d7c9f040427a10..e06c5307248d80076325708909f46e2c4b2230e3 100644
--- a/frontend-js/src/main/js/gui/leftPanel/GuiUtils.js
+++ b/frontend-js/src/main/js/gui/leftPanel/GuiUtils.js
@@ -377,7 +377,7 @@ GuiUtils.prototype.createIcon = function (icon, onclickFunction) {
     var img = document.createElement("img");
     img.src = GuiConnector.getImgPrefix() + icon;
     img.style.float = "left";
-    img.hspace = "5";
+    img.hspace = 5;
     if (onclickFunction !== undefined) {
       img.onclick = onclickFunction;
     }
diff --git a/frontend-js/src/main/js/map/data/Reaction.js b/frontend-js/src/main/js/map/data/Reaction.js
index 5aada650bd638b9ccd6289a52565ed2abf0dc3ad..8a0499c487eda93207e340385d29b1367444edb3 100644
--- a/frontend-js/src/main/js/map/data/Reaction.js
+++ b/frontend-js/src/main/js/map/data/Reaction.js
@@ -68,6 +68,10 @@ Reaction.prototype.getCenter = function () {
   return this._center;
 };
 
+/**
+ *
+ * @returns {Object[]}
+ */
 Reaction.prototype.getLines = function () {
   var result = [];
   result = result.concat(this.startLines);