diff --git a/README.md b/README.md
index 2b90521..d1fbd83 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,11 @@ Main attribute, required for directive to work, passed variable defines whether
 Time in seconds for animation to complete (default is 1 second).
 
 <code>&lt;div ng-slide-down=&quot;slideDown&quot; duration=&quot;1.5&quot;&gt;</code>
+
+#### timing-function
+Easing function (`transition-timing-function`) to use in the animation (default is ease-in-out).
+
+<code>&lt;div ng-slide-down=&quot;slideDown&quot; timing-function=&quot;linear&quot;&gt;</code>
 #### lazy-render
 Add this attribute to prevent rendering when content is hidden. Doesn't require value.
 
diff --git a/demo/ng-slide-down.js b/demo/ng-slide-down.js
index 0b4066a..c58710f 100644
--- a/demo/ng-slide-down.js
+++ b/demo/ng-slide-down.js
@@ -12,8 +12,9 @@
         }
       };
       link = function (scope, element, attrs, ctrl, transclude) {
-        var closePromise, duration, elementScope, emitOnClose, getHeight, hide, lazyRender, onClose, openPromise, show;
+        var closePromise, duration, elementScope, emitOnClose, getHeight, hide, lazyRender, onClose, openPromise, show, timingFunction;
         duration = attrs.duration || 1;
+        timingFunction = attrs.timingFunction || 'ease-in-out';
         elementScope = element.scope();
         emitOnClose = attrs.emitOnClose;
         onClose = attrs.onClose;
@@ -45,7 +46,7 @@
               overflow: 'hidden',
               transitionProperty: 'height',
               transitionDuration: '' + duration + 's',
-              transitionTimingFunction: 'ease-in-out',
+              transitionTimingFunction: timingFunction,
               height: getHeight()
             });
             return openPromise = $timeout(function () {
@@ -65,7 +66,7 @@
             overflow: 'hidden',
             transitionProperty: 'height',
             transitionDuration: '' + duration + 's',
-            transitionTimingFunction: 'ease-in-out',
+            transitionTimingFunction: timingFunction,
             height: '0px'
           });
           if (emitOnClose || onClose || lazyRender) {
diff --git a/dist/ng-slide-down.js b/dist/ng-slide-down.js
index 0b4066a..c58710f 100644
--- a/dist/ng-slide-down.js
+++ b/dist/ng-slide-down.js
@@ -12,8 +12,9 @@
         }
       };
       link = function (scope, element, attrs, ctrl, transclude) {
-        var closePromise, duration, elementScope, emitOnClose, getHeight, hide, lazyRender, onClose, openPromise, show;
+        var closePromise, duration, elementScope, emitOnClose, getHeight, hide, lazyRender, onClose, openPromise, show, timingFunction;
         duration = attrs.duration || 1;
+        timingFunction = attrs.timingFunction || 'ease-in-out';
         elementScope = element.scope();
         emitOnClose = attrs.emitOnClose;
         onClose = attrs.onClose;
@@ -45,7 +46,7 @@
               overflow: 'hidden',
               transitionProperty: 'height',
               transitionDuration: '' + duration + 's',
-              transitionTimingFunction: 'ease-in-out',
+              transitionTimingFunction: timingFunction,
               height: getHeight()
             });
             return openPromise = $timeout(function () {
@@ -65,7 +66,7 @@
             overflow: 'hidden',
             transitionProperty: 'height',
             transitionDuration: '' + duration + 's',
-            transitionTimingFunction: 'ease-in-out',
+            transitionTimingFunction: timingFunction,
             height: '0px'
           });
           if (emitOnClose || onClose || lazyRender) {
diff --git a/dist/ng-slide-down.min.js b/dist/ng-slide-down.min.js
index 50a776a..e1c76d3 100644
--- a/dist/ng-slide-down.min.js
+++ b/dist/ng-slide-down.min.js
@@ -1,2 +1,2 @@
-/*! ng-slide-down 23-04-2015 */
-(function(){"use strict";angular.module("ng-slide-down",[]).directive("ngSlideDown",["$timeout",function(a){var b,c;return b=function(a,b){return void 0!==b.lazyRender?"<div ng-if='lazyRender' ng-transclude></div>":"<div ng-transclude></div>"},c=function(b,c,d,e,f){var g,h,i,j,k,l,m,n,o,p;return h=d.duration||1,i=c.scope(),j=d.emitOnClose,n=d.onClose,m=void 0!==d.lazyRender,g=null,o=null,k=function(a){var b,d,e,f,g;for(e=0,d=c.children(),f=0,g=d.length;g>f;f++)b=d[f],e+=b.clientHeight;return""+e+"px"},p=function(){return g&&a.cancel(g),m&&(b.lazyRender=!0),a(function(){return o&&a.cancel(o),c.css({overflow:"hidden",transitionProperty:"height",transitionDuration:""+h+"s",transitionTimingFunction:"ease-in-out",height:k()}),o=a(function(){return c.css({overflow:"visible",transition:"none",height:"auto"})},1e3*h)})},l=function(){return o&&a.cancel(o),c.css({overflow:"hidden",transitionProperty:"height",transitionDuration:""+h+"s",transitionTimingFunction:"ease-in-out",height:"0px"}),j||n||m?g=a(function(){return j&&b.$emit(j,{}),n&&i.$eval(n),m?b.lazyRender=!1:void 0},1e3*h):void 0},b.$watch("expanded",function(b,d){return b?a(p):(null!=b&&(c.css({height:k()}),c[0].clientHeight),a(l))})},{restrict:"A",scope:{expanded:"=ngSlideDown"},transclude:!0,link:c,template:function(a,c){return b(a,c)}}}])}).call(this);
\ No newline at end of file
+/*! ng-slide-down 29-04-2015 */
+(function(){"use strict";angular.module("ng-slide-down",[]).directive("ngSlideDown",["$timeout",function(a){var b,c;return b=function(a,b){return void 0!==b.lazyRender?"<div ng-if='lazyRender' ng-transclude></div>":"<div ng-transclude></div>"},c=function(b,c,d,e,f){var g,h,i,j,k,l,m,n,o,p,q;return h=d.duration||1,q=d.timingFunction||"ease-in-out",i=c.scope(),j=d.emitOnClose,n=d.onClose,m=void 0!==d.lazyRender,g=null,o=null,k=function(a){var b,d,e,f,g;for(e=0,d=c.children(),f=0,g=d.length;g>f;f++)b=d[f],e+=b.clientHeight;return""+e+"px"},p=function(){return g&&a.cancel(g),m&&(b.lazyRender=!0),a(function(){return o&&a.cancel(o),c.css({overflow:"hidden",transitionProperty:"height",transitionDuration:""+h+"s",transitionTimingFunction:q,height:k()}),o=a(function(){return c.css({overflow:"visible",transition:"none",height:"auto"})},1e3*h)})},l=function(){return o&&a.cancel(o),c.css({overflow:"hidden",transitionProperty:"height",transitionDuration:""+h+"s",transitionTimingFunction:q,height:"0px"}),j||n||m?g=a(function(){return j&&b.$emit(j,{}),n&&i.$eval(n),m?b.lazyRender=!1:void 0},1e3*h):void 0},b.$watch("expanded",function(b,d){return b?a(p):(null!=b&&(c.css({height:k()}),c[0].clientHeight),a(l))})},{restrict:"A",scope:{expanded:"=ngSlideDown"},transclude:!0,link:c,template:function(a,c){return b(a,c)}}}])}).call(this);
\ No newline at end of file
diff --git a/src/ng-slide-down.coffee b/src/ng-slide-down.coffee
index c00c2d6..55f9777 100644
--- a/src/ng-slide-down.coffee
+++ b/src/ng-slide-down.coffee
@@ -8,6 +8,7 @@ angular.module("ng-slide-down", []).directive "ngSlideDown", ($timeout )->
 
   link = (scope, element, attrs, ctrl, transclude) ->
     duration = attrs.duration || 1
+    timingFunction = attrs.timingFunction || "ease-in-out"
     elementScope = element.scope()
     emitOnClose = attrs.emitOnClose
     onClose = attrs.onClose
@@ -31,7 +32,7 @@ angular.module("ng-slide-down", []).directive "ngSlideDown", ($timeout )->
           overflow: "hidden"
           transitionProperty: "height"
           transitionDuration: "#{duration}s"
-          transitionTimingFunction: "ease-in-out"
+          transitionTimingFunction: timingFunction
           height: getHeight()
         }
         openPromise = $timeout ()->
@@ -49,7 +50,7 @@ angular.module("ng-slide-down", []).directive "ngSlideDown", ($timeout )->
         overflow: "hidden"
         transitionProperty: "height"
         transitionDuration: "#{duration}s"
-        transitionTimingFunction: "ease-in-out"
+        transitionTimingFunction: timingFunction
         height: '0px'
       }
       if emitOnClose || onClose || lazyRender