diff --git a/src/pixi/display/DisplayObject.js b/src/pixi/display/DisplayObject.js
index 55764a4..42e7f5e 100644
--- a/src/pixi/display/DisplayObject.js
+++ b/src/pixi/display/DisplayObject.js
@@ -3,7 +3,8 @@
  */
 
 /**
- * The base class for all objects that are rendered on the screen.
+ * The base class for all objects that are rendered on the screen. 
+ * This is an abstract class and should not be used on its own rather it should be extended.
  *
  * @class DisplayObject
  * @constructor

diff --git a/src/pixi/display/DisplayObject.js b/src/pixi/display/DisplayObject.js
index 55764a4..42e7f5e 100644
--- a/src/pixi/display/DisplayObject.js
+++ b/src/pixi/display/DisplayObject.js
@@ -3,7 +3,8 @@
  */
 
 /**
- * The base class for all objects that are rendered on the screen.
+ * The base class for all objects that are rendered on the screen. 
+ * This is an abstract class and should not be used on its own rather it should be extended.
  *
  * @class DisplayObject
  * @constructor
diff --git a/src/pixi/extras/SPINE-LICENSE b/src/pixi/extras/SPINE-LICENSE
new file mode 100755
index 0000000..7bb7566
--- /dev/null
+++ b/src/pixi/extras/SPINE-LICENSE
@@ -0,0 +1,27 @@
+Spine Runtimes Software License
+Version 2.1
+
+Copyright (c) 2013, Esoteric Software
+All rights reserved.
+
+You are granted a perpetual, non-exclusive, non-sublicensable and
+non-transferable license to install, execute and perform the Spine Runtimes
+Software (the "Software") solely for internal use. Without the written
+permission of Esoteric Software (typically granted by licensing Spine), you
+may not (a) modify, translate, adapt or otherwise create derivative works,
+improvements of the Software or develop new applications using the Software
+or (b) remove, delete, alter or obscure any trademarks or any copyright,
+trademark, patent or other intellectual property or proprietary rights notices
+on or in the Software, including any copy thereof. Redistributions in binary
+or source form must include this license and terms.
+
+THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.