diff --git a/README.md b/README.md
index 66c1f34..22a307a 100644
--- a/README.md
+++ b/README.md
@@ -10,8 +10,9 @@ How To Use:
 3. In your config file, change `sitemap: file:` if you want your sitemap to be called something other than sitemap.xml.
 4. Change the `sitemap: exclude:` list to exclude any pages that you don't want in the sitemap. 
 5. Change the `sitemap: include_posts:` list to include any pages that are looping through your posts (e.g. "/index.html", "/notebook/index.md", etc.). This will ensure that right after you make a new post, the last modified date will be updated to reflect the new post.
-6. Run Jekyll: `jekyll build` to re-generate your site.
-7. A `sitemap.xml` should be included in your _site folder.
+6. Set an optional sitemap: change_frequency_default: that will set the change frequency if you haven't specified one in your individual page.
+7. Run Jekyll: `jekyll build` to re-generate your site.
+8. A `sitemap.xml` should be included in your _site folder.
 
 Configuration defaults:
 
diff --git a/sitemap_generator.rb b/sitemap_generator.rb
index 3b1278f..6ed0c6c 100644
--- a/sitemap_generator.rb
+++ b/sitemap_generator.rb
@@ -73,6 +73,7 @@ def generate(site)
       @config['priority_name'] = sitemap_config['priority_name'] || PRIORITY_NAME
       @config['exclude'] = sitemap_config['exclude'] || EXCLUDE
       @config['include_posts'] = sitemap_config['include_posts'] || INCLUDE_POSTS
+      @config['change_frequency_default'] = sitemap_config['change_frequency_default'].downcase if sitemap_config['change_frequency_default']
 
       sitemap = REXML::Document.new << REXML::XMLDecl.new("1.0", "UTF-8")
 
@@ -126,7 +127,7 @@ def fill_posts(site, urlset)
     def fill_pages(site, urlset)
       site.pages.each do |page|
         if !excluded?(site, page.path_to_source)
-          if File.exists?(page.path)
+          if File.exists?(File.join(site.source, page.path))
             url = fill_url(site, page)
             urlset.add_element(url)
           end
@@ -149,9 +150,9 @@ def fill_url(site, page_or_post)
 
 
 
-      if (page_or_post.data[@config['change_frequency_name']])
+      if (page_or_post.data[@config['change_frequency_name']] || @config['change_frequency_default'])
         change_frequency = 
-          page_or_post.data[@config['change_frequency_name']].downcase
+          (page_or_post.data[@config['change_frequency_name']] || @config['change_frequency_default']).downcase
           
         if (valid_change_frequency?(change_frequency))
           changefreq = REXML::Element.new "changefreq"
@@ -192,7 +193,7 @@ def fill_location(site, page_or_post)
     # Returns lastmod REXML::Element or nil
     def fill_last_modified(site, page_or_post)
       lastmod = REXML::Element.new "lastmod"
-      date = File.mtime(page_or_post.path)
+      date = File.mtime(File.join(site.source, page_or_post.path))
       latest_date = find_latest_date(date, site, page_or_post)
 
       if @last_modified_post_date == nil