diff --git a/Docs/Drag/Drag.md b/Docs/Drag/Drag.md
index 3afe3765..46035bbb 100644
--- a/Docs/Drag/Drag.md
+++ b/Docs/Drag/Drag.md
@@ -26,6 +26,7 @@ Drag Method: constructor
 * handle          - (*element*: defaults to the element passed in) The Element to act as the handle for the draggable element.
 * invert          - (*boolean*: defaults to false) Whether or not to invert the values reported on start and drag.
 * limit           - (*object*: defaults to false) An object with an x and a y property, both an array containing the minimum and maximum limit of movement of the Element.
+* ratio           - (*number*: defaults to false) Add a ratio constraint between x and y properties (ratio = x / y).
 * modifiers       - (*object*: defaults to {'x': 'left', 'y': 'top'}) An object with x and y properties used to indicate the CSS modifiers (i.e. 'left').
 * snap            - (*number*: defaults to 6) The distance to drag before the Element starts to respond to the drag.
 * style           - (*boolean*: defaults to true) Whether or not to set the modifier as a style property of the element.
diff --git a/Source/Drag/Drag.js b/Source/Drag/Drag.js
index bbe73cb4..3ddc51fd 100644
--- a/Source/Drag/Drag.js
+++ b/Source/Drag/Drag.js
@@ -43,6 +43,7 @@ var Drag = new Class({
 		grid: false,
 		style: true,
 		limit: false,
+		ratio: false,
 		handle: false,
 		invert: false,
 		preventDefault: false,
@@ -182,7 +183,15 @@ var Drag = new Class({
 					this.value.now[z] = this.limit[z][0];
 				}
 			}
-
+			
+			if(options.ratio) {
+				if(this.value.now.x / this.value.now.y < options.ratio) {
+					this.value.now.y = this.value.now.x / options.ratio;
+				} else {
+					this.value.now.x = options.ratio * this.value.now.y;
+				}
+			}
+			
 			if (options.grid[z]) this.value.now[z] -= ((this.value.now[z] - (this.limit[z][0]||0)) % options.grid[z]);
 
 			if (options.style) this.element.setStyle(options.modifiers[z], this.value.now[z] + options.unit);