diff --git a/src/Grid.vala b/src/Grid.vala
index abd108a..dfde39d 100644
--- a/src/Grid.vala
+++ b/src/Grid.vala
@@ -4,6 +4,7 @@ namespace CairoChart {
 	 * Grid of the {@link Series}.
 	 */
 	public class Grid {
+
 		/*public enum GridType {
 			PRICK_LINE = 0, // default
 			LINE
diff --git a/src/Place.vala b/src/Place.vala
index 25c5d16..5f38012 100644
--- a/src/Place.vala
+++ b/src/Place.vala
@@ -1,47 +1,62 @@
 namespace CairoChart {
 
 	/**
-	 *
+	 * {@link Series} place at the {@link Chart}.
 	 */
 	public class Place {
+
 		double _x_min = 0;
 		double _x_max = 0;
 		double _y_min = 0;
 		double _y_max = 0;
+
+		/**
+		 *
+		 */
 		public double x_min {
 			get { return _x_min; }
 			set { _x_min = zoom_x_min = value; }
 			default = 0;
 		}
+
+		/**
+		 *
+		 */
 		public double x_max {
 			get { return _x_max; }
 			set { _x_max = zoom_x_max = value; }
 			default = 0;
 		}
+
+		/**
+		 *
+		 */
 		public double y_min {
 			get { return _y_min; }
 			set { _y_min = zoom_y_min = value; }
 			default = 0;
 		}
+
+		/**
+		 *
+		 */
 		public double y_max {
 			get { return _y_max; }
 			set { _y_max = zoom_y_max = value; }
 			default = 0;
 		}
+
+		public Cairo.Rectangle zoom = Cairo.Rectangle() {
+			x = 0, x = 0, width = 1, height = 1
+		};
 		public double zoom_x_min = 0;
 		public double zoom_x_max = 1;
 		public double zoom_y_min = 0;
 		public double zoom_y_max = 1;
 
-		public virtual Place copy () {
-			var place = new Place ();
-			place.x_min = this.x_min;
-			place.x_max = this.x_max;
-			place.y_min = this.y_min;
-			place.y_max = this.y_max;
-			return place;
-		}
-
+		/**
+		 *
+		 */
 		public Place (double x_min = 0,
 		              double x_max = 1,
 		              double y_min = 0,
@@ -57,6 +72,21 @@ namespace CairoChart {
 			zoom_y_max = y_max;
 		}
 
+		/**
+		 *
+		 */
+		public virtual Place copy () {
+			var place = new Place ();
+			place.x_min = this.x_min;
+			place.x_max = this.x_max;
+			place.y_min = this.y_min;
+			place.y_max = this.y_max;
+			return place;
+		}
+
+		/**
+		 *
+		 */
 		public virtual void unzoom () {
 			zoom_x_min = x_min;
 			zoom_x_max = x_max;