diff --git a/src/Axis.vala b/src/Axis.vala
index 2bf64b4..44f9f78 100644
--- a/src/Axis.vala
+++ b/src/Axis.vala
@@ -1,23 +1,61 @@
 namespace CairoChart {
 
 	/**
-	 *
+	 * ``Chart`` axis.
 	 */
 	public class Axis {
-		public Range range = new Range();
+
 		Chart chart;
 		public Text title;
+
+		/**
+		 * ``Axis`` range/limits.
+		 */
+		public Range range = new Range();
+
+		/**
+		 * Data type.
+		 */
 		public enum DType {
+			/**
+			 * Float128 numbers.
+			 */
 			NUMBERS = 0,
+
+			/**
+			 * Date/Time.
+			 */
 			DATE_TIME
 		}
-		public enum ScaleType {
-			LINEAR = 0,		// default
-			// LOGARITHMIC, // TODO
-			// etc
-		}
+
+		/**
+		 * Data type.
+		 */
 		public DType dtype;
+
+		/**
+		 * ``Axis`` scale type.
+		 */
+		public enum ScaleType {
+			/**
+			 * Linear scale.
+			 */
+			LINEAR = 0,
+
+			/**
+			 * Logarithmic scale.
+			 */
+			// LOGARITHMIC,
+		}
+
+		/**
+		 * Scale type.
+		 */
 		public ScaleType scale_type;
+
+		/**
+		 * ``Axis`` position.
+		 */
 		public enum Position {
 			LOW = 0,
 			HIGH = 1,
@@ -66,6 +104,11 @@ namespace CairoChart {
 		public LineStyle line_style = LineStyle ();
 		public double font_spacing = 5;
 
+		public Axis (Chart chart) {
+			this.chart = chart;
+			title = new Text (chart, "");
+		}
+
 		public virtual Axis copy () {
 			var axis = new Axis (chart);
 			axis._date_format = this._date_format;
@@ -86,11 +129,6 @@ namespace CairoChart {
 			return axis;
 		}
 
-		public Axis (Chart chart) {
-			this.chart = chart;
-			title = new Text (chart, "");
-		}
-
 		public int nrecords = 128;
 
 		public virtual void format_date_time (Float128 x, out string date, out string time) {
@@ -133,8 +171,8 @@ namespace CairoChart {
 			}
 		}
 
-		public virtual void unzoom () {
-			range.unzoom();
+		public virtual void zoom_out () {
+			range.zoom_out();
 		}
 	}
 }
diff --git a/src/Chart.vala b/src/Chart.vala
index e52a57d..ad31db2 100644
--- a/src/Chart.vala
+++ b/src/Chart.vala
@@ -253,7 +253,7 @@ namespace CairoChart {
 		 * Zooms out the ``Chart``.
 		 */
 		public virtual void zoom_out () {
-			foreach (var s in series) s.unzoom();
+			foreach (var s in series) s.zoom_out();
 			zoom = new Area.with_abs (0, 0, 1, 1);
 			zoom_1st_idx = 0;
 		}
diff --git a/src/Place.vala b/src/Place.vala
index d3f3bcb..1f10a35 100644
--- a/src/Place.vala
+++ b/src/Place.vala
@@ -210,7 +210,7 @@ namespace CairoChart {
 		/**
 		 * Unzooms ``Place``.
 		 */
-		public virtual void unzoom () {
+		public virtual void zoom_out () {
 			zx0 = x0;
 			zy0 = y0;
 			zx1 = x1;
diff --git a/src/Range.vala b/src/Range.vala
index a54fbee..0527055 100644
--- a/src/Range.vala
+++ b/src/Range.vala
@@ -105,7 +105,7 @@ namespace CairoChart {
 		/**
 		 * Unzooms ``Range``.
 		 */
-		public virtual void unzoom () {
+		public virtual void zoom_out () {
 			zmin = min;
 			zmax = max;
 		}
diff --git a/src/Series.vala b/src/Series.vala
index 1e73fd4..e860f96 100644
--- a/src/Series.vala
+++ b/src/Series.vala
@@ -544,11 +544,11 @@ namespace CairoChart {
 			return Point128 (get_real_x(p.x), get_real_y(p.y));
 		}
 
-		public virtual void unzoom () {
+		public virtual void zoom_out () {
 				zoom_show = true;
-				axis_x.unzoom();
-				axis_y.unzoom();
-				place.unzoom();
+				axis_x.zoom_out();
+				axis_y.zoom_out();
+				place.zoom_out();
 		}
 	}
 }