diff --git a/src/Core/Crawl/day.h b/src/Core/Crawl/day.h
index 6ac569b..a3e4a08 100644
--- a/src/Core/Crawl/day.h
+++ b/src/Core/Crawl/day.h
@@ -20,8 +20,32 @@ template <class Sun, class Moon>
 /**
  * @brief The Day class is template wrapper for the moon and sun objects.
  * The moon and sun objects moving around world center for imitation of the day.
+ *
+ * ### Integration on the world.
+ * You need to add one object of this class in the IWorld::initWorldRules method.
+ * **Example:**
+ *
+ * ```cpp
+ * CRAWL::WorldRule *World::initWorldRules() {
+
+    using Day = CRAWL::Day<CRAWL::Sun, CRAWL::Moon>;
+
+    return new CRAWL::WorldRule {
+        {0, {
+                {registerObject<Day>(), 1},
+            }
+        },
+        {1000, {
+                {registerObject<Day>(), 1},
+            }
+        },
+    };
+}
+ * ```
  * @note All objects will be moving around this objects with radius. The Radius by default is 2000.
  * @note This class automaticly sets ligth force for the light objects.
+ *
+ *
  */
 class Day: public IWorldItem, public Claster
 {
diff --git a/src/Core/Crawl/defaultlight.h b/src/Core/Crawl/defaultlight.h
index 4764537..50c14e2 100644
--- a/src/Core/Crawl/defaultlight.h
+++ b/src/Core/Crawl/defaultlight.h
@@ -14,7 +14,9 @@
 namespace CRAWL {
 
 /**
- * @brief The DefaultLight class This is default implementation of the wirld light.
+ * @brief The DefaultLight class This is default implementation of the world light.
+ * This object create uniform illumination for all world.
+ * For integration This object yo worl see the IWorld::initWorldRules method
  */
 class DefaultLight final:  public IWorldLight
 {
diff --git a/src/Core/Crawl/iworldlight.h b/src/Core/Crawl/iworldlight.h
index 74d33c5..50dac42 100644
--- a/src/Core/Crawl/iworldlight.h
+++ b/src/Core/Crawl/iworldlight.h
@@ -18,6 +18,28 @@ namespace CRAWL {
  * You need to create own qml file with light.
  *
  * @note If you wnat to create a new qml file the you need to inherit from the Light.qml file.
+ *
+ * ### Integration on the world.
+ * You need to add one object of this class in the IWorld::initWorldRules method.
+ * **Example:**
+ *
+ * ```cpp
+ * CRAWL::WorldRule *World::initWorldRules() {
+
+    return new CRAWL::WorldRule {
+        {0, {
+                {registerObject<MyLightObject>(), 1},
+            }
+        },
+        {1000, {
+                {registerObject<MyLightObject>(), 1},
+            }
+        },
+    };
+}
+ * ```
+ *
+ * For integration This object you world see the IWorld::initWorldRules method
  */
 class CRAWL_EXPORT IWorldLight: public ClasterItem
 {
@@ -30,6 +52,7 @@ class CRAWL_EXPORT IWorldLight: public ClasterItem
     Q_PROPERTY(float shadowBias READ shadowBias WRITE setShadowBias NOTIFY shadowBiasChanged)
 
 public:
+
     IWorldLight(const QString& name,
                 const QString& viewTempalte = "qrc:/CrawlModule/Light.qml",
                 QObject *ptr = nullptr);