diff --git a/examples/simple-hexbinlayer-demo/src/main/java/pl/itrack/leafletd3demo/client/DataGenerator.java b/examples/simple-hexbinlayer-demo/src/main/java/pl/itrack/leafletd3demo/client/DataGenerator.java
index c76c332..a509bd4 100644
--- a/examples/simple-hexbinlayer-demo/src/main/java/pl/itrack/leafletd3demo/client/DataGenerator.java
+++ b/examples/simple-hexbinlayer-demo/src/main/java/pl/itrack/leafletd3demo/client/DataGenerator.java
@@ -18,6 +18,12 @@
  * and https://npm.runkit.com/d3-random
  * <p>
  * Alternatively I could simply use the `gwt-d3` library, but just a very small piece was needed.
+ *
+ * <p>
+ * MIT License
+ * <p>
+ * Copyright (c) 2018 <a href="https://github.com/baldram">Marcin Szalomski</a>
+ * <p>
  */
 @JsType
 class DataGenerator {
diff --git a/examples/simple-hexbinlayer-demo/src/main/java/pl/itrack/leafletd3demo/client/DemoApp.java b/examples/simple-hexbinlayer-demo/src/main/java/pl/itrack/leafletd3demo/client/DemoApp.java
index 3719f94..6b4d099 100644
--- a/examples/simple-hexbinlayer-demo/src/main/java/pl/itrack/leafletd3demo/client/DemoApp.java
+++ b/examples/simple-hexbinlayer-demo/src/main/java/pl/itrack/leafletd3demo/client/DemoApp.java
@@ -16,7 +16,16 @@
 import static elemental2.dom.DomGlobal.document;
 
 /**
- * Entry point classes define <code>onModuleLoad()</code>
+ * A demo project using gwt-leaflet-d3 library.
+ * Entry point class defining <code>onModuleLoad()</code>.
+ * <p>
+ * It's a simple example and the whole application logic is in the main controller.
+ * In the real life project parts of code would be extracted to separate components and injected here.
+ * <p>
+ * MIT License
+ * <p>
+ * Copyright (c) 2018 <a href="https://github.com/baldram">Marcin Szalomski</a>
+ * <p>
  */
 public class DemoApp implements EntryPoint {
 
diff --git a/src/main/java/pl/itrack/leafletd3/client/LeafletD3.java b/src/main/java/pl/itrack/leafletd3/client/LeafletD3.java
index 4c172f4..c4854fa 100644
--- a/src/main/java/pl/itrack/leafletd3/client/LeafletD3.java
+++ b/src/main/java/pl/itrack/leafletd3/client/LeafletD3.java
@@ -3,10 +3,23 @@
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
+/**
+ * The library initialization.
+ * Call for required JS dependencies.
+ *
+ * The gwt-leaflet-d3 is a plugin for Leaflet.
+ * It requires also https://github.com/gwidgets/gwty-leaflet as a main Leaflet map base.
+ *
+ * <p>
+ * MIT License
+ * <p>
+ * Copyright (c) 2018 <a href="https://github.com/baldram">Marcin Szalomski</a>
+ * <p>
+ */
 public class LeafletD3 {
 
     public static void init(LeafletD3LibInjector.CallbackFn callbackFn) {
-        // TODO: provide the resources bundle together with the gwt-leaflet-d3 lib
+        // TODO: provide the resources bundled together with the gwt-leaflet-d3 lib
         LeafletD3LibInjector.injectScripts(
                 Stream.of(
                         "https://d3js.org/d3.v4.min.js",
diff --git a/src/main/java/pl/itrack/leafletd3/client/LeafletD3LibInjector.java b/src/main/java/pl/itrack/leafletd3/client/LeafletD3LibInjector.java
index 8c19aed..b5083f0 100644
--- a/src/main/java/pl/itrack/leafletd3/client/LeafletD3LibInjector.java
+++ b/src/main/java/pl/itrack/leafletd3/client/LeafletD3LibInjector.java
@@ -7,6 +7,15 @@
 
 import java.util.List;
 
+/**
+ * Dynamically attach to the DOM necessary resources with callback when ready
+ *
+ * <p>
+ * MIT License
+ * <p>
+ * Copyright (c) 2018 <a href="https://github.com/baldram">Marcin Szalomski</a>
+ * <p>
+ */
 public class LeafletD3LibInjector {
 
     private static boolean processed = false;
diff --git a/src/main/java/pl/itrack/leafletd3/client/wrapper/HexbinLayer.java b/src/main/java/pl/itrack/leafletd3/client/wrapper/HexbinLayer.java
index a88e48c..c29e916 100644
--- a/src/main/java/pl/itrack/leafletd3/client/wrapper/HexbinLayer.java
+++ b/src/main/java/pl/itrack/leafletd3/client/wrapper/HexbinLayer.java
@@ -8,11 +8,21 @@
 // TODO: to wrap events handling and Pings layer
 
 /**
+ * The GWT JsInterop wrapper for @Asymmetrik/leaflet-d3 JavaScript library.
+ * Provides Hexbin functionality as the one here:
  * https://github.com/Asymmetrik/leaflet-d3/blob/master/src/js/hexbin/HexbinLayer.js
- * L is defined by the Leaflet library (see git://github.com/Leaflet/Leaflet.git for documentation).
+ *
+ * <p>
+ * Note: The "L" is defined by the Leaflet library (see git://github.com/Leaflet/Leaflet.git for documentation).
  * and wrapped by https://github.com/gwidgets/gwty-leaflet .
  * The L is being extended to add d3-hexbin related functions.
  *
+ * <p>
+ * MIT License
+ * <p>
+ * Copyright (c) 2018 <a href="https://github.com/baldram">Marcin Szalomski</a>
+ * <p>
+ *
  * @param <T> a data item type (eg. simply <double[] for Latitude and Longitude pair)
  */
 @JsType(isNative = true, namespace = "L", name = "hexbinLayer")