OK In progress...

src/Color.vala

@@ -27,6 +27,10 @@ namespace CairoChart {
 
 		/**
 		 * Constructs a new ``Color``.
+		 * @param red red component.
+		 * @param green green component.
+		 * @param blue blue component.
+		 * @param alpha alpha component.
 		 */
 		public Color (double red = 0.0,
 		              double green = 0.0,

src/Grid.vala

@@ -1,13 +1,27 @@
 namespace CairoChart {
+
+	/**
+	 *
+	 */
 	public class Grid {
 		/*public enum GridType {
 			PRICK_LINE = 0, // default
 			LINE
 		}*/
+
+		/**
+		 *
+		 */
 		public Color color = Color (0, 0, 0, 0.1);
 
+		/**
+		 *
+		 */
 		public Line.Style line_style = Line.Style ();
 
+		/**
+		 *
+		 */
 		public virtual Grid copy () {
 			var grid = new Grid ();
 			grid.color = this.color;
@@ -15,6 +29,9 @@ namespace CairoChart {
 			return grid;
 		}
 
+		/**
+		 *
+		 */
 		public Grid () {
 			line_style.dashes = {2, 3};
 		}