diff --git a/README.md b/README.md
index 0ac4b98..c05750c 100644
--- a/README.md
+++ b/README.md
@@ -186,6 +186,11 @@ var particleEmitter = new ShaderParticleEmitter({
 	// [OPTIONAL] Particle end size.
 	sizeEnd: 10,
 
+	// [OPTIONAL] Particle start rotation.
+	particleRotation: 0
+
+	// [OPTIONAL] Particle rotation variance ( in radians ).
+	particleRotationSpread: 0
 
 	// [OPTIONAL] Particle start colour.
 	colorStart: new THREE.Color( 'white' ),
@@ -253,4 +258,4 @@ See the [issues page](https://github.com/squarefeet/ShaderParticleEngine/issues)
 
 Thanks
 ======
-Huge thanks are extended to [Stemkoski](http://stemkoski.github.io/Three.js/) for his initial particle engine, and to [Mr Doob, AlteredQualia, et. al](https://github.com/mrdoob/three.js/graphs/contributors) for their awesome work on [THREE.js](http://threejs.org/).
\ No newline at end of file
+Huge thanks are extended to [Stemkoski](http://stemkoski.github.io/Three.js/) for his initial particle engine, and to [Mr Doob, AlteredQualia, et. al](https://github.com/mrdoob/three.js/graphs/contributors) for their awesome work on [THREE.js](http://threejs.org/).
diff --git a/build/ShaderParticles.js b/build/ShaderParticles.js
index 03b7b49..88ad398 100644
--- a/build/ShaderParticles.js
+++ b/build/ShaderParticles.js
@@ -316,6 +316,7 @@ ShaderParticleGroup.prototype = {
             opacity[i]          = emitter.opacityStart;
             opacityMiddle[i]    = emitter.opacityMiddle;
             opacityEnd[i]       = emitter.opacityEnd;
+            rotation[i]         = that._randomFloat( emitter.particleRotation, emitter.particleRotationSpread );
         }
 
         // Cache properties on the emitter so we can access
@@ -505,6 +506,7 @@ ShaderParticleGroup.shaders = {
 
         'attribute vec3 customColor;',
         'attribute vec3 customColorEnd;',
+        'attribute float rotation;',
         'attribute float opacity;',
         'attribute float opacityMiddle;',
         'attribute float opacityEnd;',
@@ -517,6 +519,7 @@ ShaderParticleGroup.shaders = {
         'attribute float sizeEnd;',
 
         'varying vec4 vColor;',
+        'varying float vRotation;',
 
         // Linearly lerp a float
         'float Lerp( float start, float end, float amount ) {',
@@ -552,6 +555,8 @@ ShaderParticleGroup.shaders = {
 
         'void main() {',
 
+            'vRotation = rotation;',
+
             'float positionInTime = (age / duration);',
             'float halfDuration = (duration / 2.0);',
 
@@ -610,10 +615,11 @@ ShaderParticleGroup.shaders = {
         'uniform int colorize;',
 
         'varying vec4 vColor;',
+        'varying float vRotation;',
 
         'void main() {',
-            'float c = cos(0.0);',
-            'float s = sin(0.0);',
+            'float c = cos( vRotation );',
+            'float s = sin( vRotation );',
 
             'vec2 rotatedUV = vec2(c * (gl_PointCoord.x - 0.5) + s * (gl_PointCoord.y - 0.5) + 0.5,',
                                   'c * (gl_PointCoord.y - 0.5) - s * (gl_PointCoord.x - 0.5) + 0.5);',
diff --git a/src/ShaderParticleEmitter.js b/src/ShaderParticleEmitter.js
index 74fab71..57f8fc1 100644
--- a/src/ShaderParticleEmitter.js
+++ b/src/ShaderParticleEmitter.js
@@ -42,6 +42,9 @@ function ShaderParticleEmitter( options ) {
     that.colorEnd               = options.colorEnd instanceof THREE.Color ? options.colorEnd : new THREE.Color( 'blue' );
     that.colorSpread            = options.colorSpread instanceof THREE.Vector3 ? options.colorSpread : new THREE.Vector3();
 
+    that.particleRotation       = parseFloat( typeof options.particleRotation === 'number' ? options.particleRotation : 0, 10 );
+    that.particleRotationSpread = parseFloat( typeof options.particleRotationSpread === 'number' ? options.particleRotationSpread : 0, 10 );
+
     that.opacityStart           = parseFloat( typeof options.opacityStart !== 'undefined' ? options.opacityStart : 1, 10 );
     that.opacityEnd             = parseFloat( typeof options.opacityEnd === 'number' ? options.opacityEnd : 0, 10 );
     that.opacityMiddle          = parseFloat(