diff --git a/src/index.js b/src/index.js
index d279952..5e67696 100644
--- a/src/index.js
+++ b/src/index.js
@@ -2,7 +2,7 @@
 require('./polyfill');
 
 var core = require('./core'),
-	assign = Object.assign;
+    assign = Object.assign;
 
 assign(core, require('./core/math'));
 assign(core, require('./extras'));

diff --git a/src/index.js b/src/index.js
index d279952..5e67696 100644
--- a/src/index.js
+++ b/src/index.js
@@ -2,7 +2,7 @@
 require('./polyfill');
 
 var core = require('./core'),
-	assign = Object.assign;
+    assign = Object.assign;
 
 assign(core, require('./core/math'));
 assign(core, require('./extras'));
diff --git a/src/polyfill/Object.assign.js b/src/polyfill/Object.assign.js
index 9615210..393240e 100644
--- a/src/polyfill/Object.assign.js
+++ b/src/polyfill/Object.assign.js
@@ -1,3 +1,8 @@
-if (!Object.assign) {
-	Object.assign = require('object-assign');
+// References:
+// https://github.com/sindresorhus/object-assign
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
+
+if (!Object.assign)
+{
+    Object.assign = require('object-assign');
 }