diff --git a/src/Color.vala b/src/Color.vala
index a784283..cc5fea2 100644
--- a/src/Color.vala
+++ b/src/Color.vala
@@ -35,7 +35,8 @@ namespace CairoChart {
 		public Color (double red = 0.0,
 		              double green = 0.0,
 		              double blue = 0.0,
-		              double alpha = 1.0) {
+		              double alpha = 1.0
+		) {
 			this.red = red;
 			this.green = green;
 			this.blue = blue;
diff --git a/src/Font.vala b/src/Font.vala
index 229c387..58e8009 100644
--- a/src/Font.vala
+++ b/src/Font.vala
@@ -63,7 +63,8 @@ namespace CairoChart {
 			                  Cairo.FontSlant slant = Cairo.FontSlant.NORMAL,
 			                  Cairo.FontWeight weight = Cairo.FontWeight.NORMAL,
 			                  double size = 10,
-			                  Font.Orientation orientation = Font.Orientation.HORIZONTAL) {
+			                  Font.Orientation orientation = Font.Orientation.HORIZONTAL
+			) {
 				this.family = family;
 				this.slant = slant;
 				this.weight = weight;
diff --git a/src/Line.vala b/src/Line.vala
index 06ed962..74e56df 100644
--- a/src/Line.vala
+++ b/src/Line.vala
@@ -1,22 +1,60 @@
 namespace CairoChart {
 
+	/**
+	 * ``Chart`` line.
+	 */
 	public class Line {
 
+		/**
+		 * Line Style.
+		 */
 		public struct Style {
 
-			double width;
-			Cairo.LineJoin join;
-			Cairo.LineCap cap;
-			double[]? dashes;
-			double dash_offset;
+			/**
+			 * Line color.
+			 */
 			Color color;
 
+			/**
+			 * A line width.
+			 */
+			double width;
+
+			/**
+			 * An array specifying alternate lengths of on and off stroke portions.
+			 */
+			double[]? dashes;
+
+			/**
+			 * An offset into the dash pattern at which the stroke should start.
+			 */
+			double dash_offset;
+			/**
+			 * A line join style.
+			 */
+			Cairo.LineJoin join;
+
+			/**
+			 * A line cap style.
+			 */
+			Cairo.LineCap cap;
+
+			/**
+			 * Constructs a new ``Style``.
+			 * @param color line color.
+			 * @param width a line width.
+			 * @param dashes an array specifying alternate lengths of on and off stroke portions.
+			 * @param dash_offset an offset into the dash pattern at which the stroke should start.
+			 * @param join a line join style.
+			 * @param cap a line cap style.
+			 */
 			public Style (Color color = Color(),
-			                  double width = 1,
-			                  double[]? dashes = null, double dash_offset = 0,
-			                  Cairo.LineJoin join = Cairo.LineJoin.MITER,
-			                  Cairo.LineCap cap = Cairo.LineCap.ROUND
-			                  ) {
+			              double width = 1,
+			              double[]? dashes = null,
+			              double dash_offset = 0,
+			              Cairo.LineJoin join = Cairo.LineJoin.MITER,
+			              Cairo.LineCap cap = Cairo.LineCap.ROUND
+			) {
 				this.width = width;
 				this.join = join;
 				this.cap = cap;
@@ -25,6 +63,9 @@ namespace CairoChart {
 				this.color = color;
 			}
 
+			/**
+			 * Applies current style to the {@link Chart} ``Context``.
+			 */
 			public void apply (Chart chart) {
 				chart.color = color;
 				chart.ctx.set_line_join(join);
@@ -33,5 +74,7 @@ namespace CairoChart {
 				chart.ctx.set_dash(dashes, dash_offset);
 			}
 		}
+
+		private Line () { }
 	}
 }
diff --git a/src/Marker.vala b/src/Marker.vala
index 04c0955..9f0cf63 100644
--- a/src/Marker.vala
+++ b/src/Marker.vala
@@ -15,7 +15,9 @@ namespace CairoChart {
 		public Type type = Type.NONE;
 		public double size = 8.0;
 
-		public Marker (Type type = Type.NONE, double size = 8.0) {
+		public Marker (Type type = Type.NONE,
+		               double size = 8.0
+		) {
 			this.type = type;
 			this.size = size;
 		}
diff --git a/src/Place.vala b/src/Place.vala
index b6345dd..6b45820 100644
--- a/src/Place.vala
+++ b/src/Place.vala
@@ -38,7 +38,8 @@ namespace CairoChart {
 			return place;
 		}
 
-		public Place (double x_min = 0, double x_max = 1, double y_min = 0, double y_max = 1) {
+		public Place (double x_min = 0,
+		              double x_max = 1, double y_min = 0, double y_max = 1) {
 			this.x_min = x_min;
 			this.x_max = x_max;
 			this.y_min = y_min;