diff --git a/src/core/core.scale.js b/src/core/core.scale.js
index f48b67a5ec1..89df4304b5b 100644
--- a/src/core/core.scale.js
+++ b/src/core/core.scale.js
@@ -538,17 +538,33 @@ module.exports = function(Chart) {
 			return rawValue;
 		},
 
-		// Used to get the value to display in the tooltip for the data at the given index
-		// function getLabelForIndex(index, datasetIndex)
+		/**
+		 * Used to get the value to display in the tooltip for the data at the given index
+		 * @param index
+		 * @param datasetIndex
+		 */
 		getLabelForIndex: helpers.noop,
 
-		// Used to get data value locations.  Value can either be an index or a numerical value
+		/**
+		 * Returns the location of the given data point. Value can either be an index or a numerical value
+		 * The coordinate (0, 0) is at the upper-left corner of the canvas
+		 * @param value
+		 * @param index
+		 * @param datasetIndex
+		 */
 		getPixelForValue: helpers.noop,
 
-		// Used to get the data value from a given pixel. This is the inverse of getPixelForValue
+		/**
+		 * Used to get the data value from a given pixel. This is the inverse of getPixelForValue
+		 * The coordinate (0, 0) is at the upper-left corner of the canvas
+		 * @param pixel
+		 */
 		getValueForPixel: helpers.noop,
 
-		// Used for tick location, should
+		/**
+		 * Returns the location of the tick at the given index
+		 * The coordinate (0, 0) is at the upper-left corner of the canvas
+		 */
 		getPixelForTick: function(index) {
 			var me = this;
 			var offset = me.options.offset;
@@ -569,7 +585,10 @@ module.exports = function(Chart) {
 			return me.top + (index * (innerHeight / (me._ticks.length - 1)));
 		},
 
-		// Utility for getting the pixel location of a percentage of scale
+		/**
+		 * Utility for getting the pixel location of a percentage of scale
+		 * The coordinate (0, 0) is at the upper-left corner of the canvas
+		 */
 		getPixelForDecimal: function(decimal) {
 			var me = this;
 			if (me.isHorizontal()) {
@@ -583,6 +602,10 @@ module.exports = function(Chart) {
 			return me.top + (decimal * me.height);
 		},
 
+		/**
+		 * Returns the pixel for the minimum chart value
+		 * The coordinate (0, 0) is at the upper-left corner of the canvas
+		 */
 		getBasePixel: function() {
 			return this.getPixelForValue(this.getBaseValue());
 		},