diff --git a/site/models/file.class.js b/site/models/file.class.js
index 47e80e0..4541954 100644
--- a/site/models/file.class.js
+++ b/site/models/file.class.js
@@ -19,15 +19,25 @@ class File
 	create_version( content )
 	{
 		// Create version
-		let version = {}
+		let version      = {},
+			last_version = this.get_last_version()
 
-		// Set up
 		version.date    = new Date()
 		version.content = content
+		version.diff    = last_version ? diff.diffChars( last_version.content, version.content ) : false
 
+		// Save
 		this.versions.push( version )
 	}
 
+	get_last_version()
+	{
+		if( this.versions.length === 0 )
+			return false
+
+		return this.versions[ this.versions.length - 1 ]
+	}
+
 	destructor()
 	{
 		console.log( 'destruct' )
diff --git a/test-folder/test-1.txt b/test-folder/test-1.txt
index c16eceb..99cde7e 100644
--- a/test-folder/test-1.txt
+++ b/test-folder/test-1.txt
@@ -1,3 +1,10 @@
 dsfsdf
 
+aaaa
+
 dsfsdf
+
+bbbb
+
+dsfsdf
+sodifja
\ No newline at end of file