diff --git a/README.md b/README.md
index c1746bb..d500318 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ Or using latest source code:
 ```
 rake install
 ```
-  
+
 ## Configuration
 
 Add gem to your Gemfile and you're ready to go:
@@ -27,13 +27,13 @@ gem 'xml-sitemap'
 ```
 
 ## Usage
-  
+
 Simple usage:
 
 ```ruby
 map = XmlSitemap::Map.new('domain.com') do |m|
   # Adds a simple page
-  m.add '/page1'  
+  m.add '/page1'
 
   # You can drop leading slash, it will be automatically added
   m.add 'page2'
@@ -70,8 +70,8 @@ You can also create a map via shortcut:
 map = XmlSitemap.new('foobar.com')
 map = XmlSitemap.map('foobar.com')
 ```
-  
-By default XmlSitemap creates a map with link to homepage of your domain. 
+
+By default XmlSitemap creates a map with link to homepage of your domain.
 
 Homepage priority is `1.0`.
 
@@ -100,11 +100,11 @@ Available options:
 - `:home`   - Disable homepage autocreation, but you still can do that manually. *(default: true)*
 - `:root`   - Force all links to fall under the main domain. You can add full urls (not paths) if set to false. *(default: true)*
 - `:time`   - Provide a creation time for the sitemap. (default: current time)
-- `:group`  - Group name for sitemap index. *(default: sitemap)* 
+- `:group`  - Group name for sitemap index. *(default: sitemap)*
 
 ### Render Engines
 
-XmlSitemap has a few different rendering engines. You can select one passing argument to `render` method. 
+XmlSitemap has a few different rendering engines. You can select one passing argument to `render` method.
 
 Available engines:
 
@@ -123,7 +123,7 @@ Usage:
 ```ruby
 map = XmlSitemap::Map.new('domain.com')
 map.add 'page'
-    
+
 index = XmlSitemap::Index.new
 
 # or if you want the URLs to use HTTPS
diff --git a/lib/xml-sitemap.rb b/lib/xml-sitemap.rb
index c364d93..9a03343 100644
--- a/lib/xml-sitemap.rb
+++ b/lib/xml-sitemap.rb
@@ -23,15 +23,15 @@ class << self
     # options - Map options
     #
     def map(domain, options={})
-      XmlSitemap::Map.new(domain, options) 
+      XmlSitemap::Map.new(domain, options)
     end
-    
+
     alias :new :map
-    
+
     # Shortcut to XmlSitemap::Index.new
     #
     # options - Index options
-    # 
+    #
     def index(options={})
       XmlSitemap::Index.new(options)
     end
diff --git a/lib/xml-sitemap/index.rb b/lib/xml-sitemap/index.rb
index 7c486a3..1d1b964 100644
--- a/lib/xml-sitemap/index.rb
+++ b/lib/xml-sitemap/index.rb
@@ -1,7 +1,7 @@
 module XmlSitemap
   class Index
     attr_reader :maps
-    
+
     # Initialize a new Index instance
     #
     # opts   - Index options
@@ -12,25 +12,25 @@ def initialize(opts={})
       @maps     = []
       @offsets  = Hash.new(0)
       @secure   = opts[:secure] || false
-      
+
       yield self if block_given?
     end
-    
+
     # Add map object to index
     #
     # map - XmlSitemap::Map instance
     #
-    def add(map, use_offsets=true)
+    def add(map, use_offsets=true, start_offset = 0)
       raise ArgumentError, 'XmlSitemap::Map object required!' unless map.kind_of?(XmlSitemap::Map)
       raise ArgumentError, 'Map is empty!' if map.empty?
-      
+
       @maps << {
-        :loc     => use_offsets ? map.index_url(@offsets[map.group], @secure) : map.plain_index_url(@secure),
+        :loc     => use_offsets ? map.index_url(start_offset + @offsets[map.group], @secure) : map.plain_index_url(@secure),
         :lastmod => map.created_at.utc.iso8601
       }
       @offsets[map.group] += 1
     end
-    
+
     # Generate sitemap XML index
     #
     def render
@@ -45,7 +45,7 @@ def render
         end
       }.to_s
     end
-    
+
     # Render XML sitemap index into the file
     #
     # path    - Output filename
@@ -56,11 +56,11 @@ def render
     def render_to(path, options={})
       overwrite = options[:overwrite] || true
       path = File.expand_path(path)
-      
+
       if File.exists?(path) && !overwrite
         raise RuntimeError, "File already exists and not overwritable!"
       end
-      
+
       File.open(path, 'w') { |f| f.write(self.render) }
     end
   end
diff --git a/lib/xml-sitemap/item.rb b/lib/xml-sitemap/item.rb
index a1387c4..3bd90c1 100644
--- a/lib/xml-sitemap/item.rb
+++ b/lib/xml-sitemap/item.rb
@@ -9,7 +9,7 @@ class Item
                 :video_thumbnail_location, :video_title, :video_description, :video_content_location, :video_player_location,
                 :video_duration, :video_expiration_date, :video_rating, :video_view_count, :video_publication_date, :video_family_friendly, :video_category,
                 :video_restriction, :video_gallery_location, :video_price, :video_requires_subscription, :video_uploader, :video_platform, :video_live
-                
+
     def initialize(target, opts={})
       @target            = target.to_s.strip
       @updated           = opts[:updated]  || Time.now
diff --git a/xml-sitemap.gemspec b/xml-sitemap.gemspec
index c287d6c..11d83b8 100644
--- a/xml-sitemap.gemspec
+++ b/xml-sitemap.gemspec
@@ -8,14 +8,14 @@ Gem::Specification.new do |s|
   s.homepage    = "http://github.com/sosedoff/xml-sitemap"
   s.authors     = ["Dan Sosedoff"]
   s.email       = ["dan.sosedoff@gmail.com"]
-  
+
   s.add_development_dependency 'rake',      '~> 10.0'
   s.add_development_dependency 'rspec',     '~> 2.13'
   s.add_development_dependency 'simplecov', '~> 0.7'
   s.add_development_dependency 'nokogiri',  '~> 1.5'
-  
+
   s.add_runtime_dependency 'builder',  '>= 2.0'
-  
+
   s.files         = `git ls-files`.split("\n")
   s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
   s.executables   = `git ls-files -- bin/*`.split("\n").map{|f| File.basename(f)}