In progress...

src/Chart.vala

@@ -59,7 +59,7 @@ namespace CairoChart {
 		public Series[] series = {};
 
 		/**
-		 * index of the 1'st shown series in a zoommed area.
+		 * Index of the 1'st shown series in a zoommed area.
 		 */
 		public int zoom_1st_idx { get; protected set; default = 0; }
 

src/Font.vala

@@ -1,20 +1,64 @@
 namespace CairoChart {
 
+	/**
+	 * Text font.
+	 */
 	public class Font {
 
+		/**
+		 * ``Font`` orientation.
+		 */
 		public enum Orientation {
+
+			/**
+			 * Horizontal font/text orientation.
+			 */
 			HORIZONTAL = 0,
+
+			/**
+			 * Vertical font/text orientation.
+			 */
 			VERTICAL
 		}
 
+		/**
+		 * ``Font`` Style.
+		 */
 		public struct Style {
+
+			/**
+			 * A font family name, encoded in UTF-8.
+			 */
 			string family;
+
+			/**
+			 * The slant for the font.
+			 */
 			Cairo.FontSlant slant;
+
+			/**
+			 * The weight for the font.
+			 */
 			Cairo.FontWeight weight;
 
-			Orientation orientation;
+			/**
+			 * The new font size, in user space units.
+			 */
 			double size;
 
+			/**
+			 * Font/Text orientation.
+			 */
+			Orientation orientation;
+
+			/**
+			 * Constructs a new ``Style``.
+			 * @param family a font family name, encoded in UTF-8.
+			 * @param slant the slant for the font.
+			 * @param weight the weight for the font.
+			 * @param size the new font size, in user space units.
+			 * @param orientation font/text orientation.
+			 */
 			public Style (string family = "Sans",
 			                  Cairo.FontSlant slant = Cairo.FontSlant.NORMAL,
 			                  Cairo.FontWeight weight = Cairo.FontWeight.NORMAL,
@@ -27,5 +71,7 @@ namespace CairoChart {
 				this.orientation = orientation;
 			}
 		}
+
+		private Font () { }
 	}
 }