README.rdoc in alexrabarts-big_sitemap-0.4.0 vs README.rdoc in alexrabarts-big_sitemap-0.5.0

@@ -69,16 +69,17 @@
 To ping search engines, call <code>ping_search_engines</code> after you generate the sitemap:
 
   sitemap.generate
   sitemap.ping_search_engines
 
-=== Change Frequency and Priority
+=== Change Frequency, Priority and Last Modified
 
-You can control "changefreq" and "priority" values for each record individually by passing lambdas instead of fixed values:
+You can control "changefreq", "priority" and "lastmod" values for each record individually by passing lambdas instead of fixed values:
 
   sitemap.add(Posts,
     :change_frequency => lambda {|post| ... },
-    :priority         => lambda {|post| ... }
+    :priority         => lambda {|post| ... },
+    :last_modified    => lambda {|post| ... }
   )
 
 === Find Methods
 
 Your models must provide either a <code>find_for_sitemap</code> or <code>all</code> class method that returns the instances that are to be included in the sitemap.