diff --git a/lib/cubicle.rb b/lib/cubicle.rb
index a0344a0..eed028f 100644
--- a/lib/cubicle.rb
+++ b/lib/cubicle.rb
@@ -1,5 +1,6 @@
 require "rubygems"
 require "active_support"
+require "active_support/hash_with_indifferent_access" unless defined?(HashWithIndifferentAccess)
 require "mongo"
 require "logger"
 require "mustache"
diff --git a/lib/cubicle/mongo_environment.rb b/lib/cubicle/mongo_environment.rb
index 7461f16..d5033ec 100644
--- a/lib/cubicle/mongo_environment.rb
+++ b/lib/cubicle/mongo_environment.rb
@@ -1,3 +1,9 @@
+#This class represents MongoDB. It is lifted line for line from MongoMapper
+#http://github.com/jnunemaker/mongomapper/blob/master/lib/mongo_mapper.rb
+#Actually, if the MongoMapper gem is loaded, Cubicle will simply use it for
+#providing the MongoEnvironment. However, if MongoMapper isn't loaded,
+#this stuff is still required, so why reinvent the wheel?
+
 module Cubicle
   class MongoEnvironment
 
@@ -25,7 +31,7 @@ def self.database=(name)
     # @api public
     def self.database
       if @@database_name.blank?
-        raise 'You forgot to set the default database name: MongoMapper.database = "foobar"'
+        raise 'You forgot to set the default database name: Cubicle.mongo.database = "foobar"'
       end
 
       @@database ||= connection.db(@@database_name)
@@ -95,8 +101,4 @@ def self.normalize_object_id(value)
     end
   end
 end
-#This class represents MongoDB. It is lifted line for line from MongoMapper
-#http://github.com/jnunemaker/mongomapper/blob/master/lib/mongo_mapper.rb
-#Actually, if the MongoMapper gem is loaded, Cubicle will simply use it for
-#providing the MongoEnvironment. However, if MongoMapper isn't loaded,
-#this stuff is still required, so why reinvent the wheel?
+
diff --git a/lib/cubicle/support.rb b/lib/cubicle/support.rb
index 990296c..77b47fb 100644
--- a/lib/cubicle/support.rb
+++ b/lib/cubicle/support.rb
@@ -53,4 +53,22 @@ def by!(step_by)
     first.step_by = step_by if first.respond_to?(:step_by=)
     self
   end
+end
+
+module Mongo
+  class Connection
+    def slave_lag
+      args = BSON::OrderedHash.new
+      args["serverStatus"] = 1
+      args["repl"] = 1
+      result = self["admin"].command(args)
+      local_time = result["localTime"]
+      sources = {}
+      result["repl"]["sources"].each do |source|
+        sync_time = source["syncedTo"]["time"]
+        sources[source["host"]] = local_time - sync_time
+      end
+      sources     
+    end
+  end
 end
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