diff --git a/lib/mongo/gridfs/grid_store.rb b/lib/mongo/gridfs/grid_store.rb
index 5501d93..a01d1a7 100644
--- a/lib/mongo/gridfs/grid_store.rb
+++ b/lib/mongo/gridfs/grid_store.rb
@@ -118,7 +118,7 @@ module GridFS
           gs.readlines(separator)
         }
       end
-
+      
       def unlink(db, *names)
         names.each { |name|
           gs = GridStore.new(db, name)
@@ -128,6 +128,10 @@ module GridFS
       end
       alias_method :delete, :unlink
 
+      def mv(db, src, dest, root_collection=DEFAULT_ROOT_COLLECTION)
+        db.collection("#{root_collection}.files").update({ :filename => src }, { '$set' => { :filename => dest } })
+      end
+
     end
 
     #---
diff --git a/test/test_grid_store.rb b/test/test_grid_store.rb
index 6e85632..5e60ddf 100644
--- a/test/test_grid_store.rb
+++ b/test/test_grid_store.rb
@@ -151,6 +151,16 @@ class GridStoreTest < Test::Unit::TestCase
     assert_equal 0, @@files.count
     assert_equal 0, @@chunks.count
   end
+  
+  def test_mv
+    assert_equal 1, @@files.count
+    assert_equal 1, @@chunks.count
+    GridStore.mv(@@db, 'foobar', 'bazqux')
+    assert_equal 1, @@files.count
+    assert_equal 1, @@chunks.count
+    assert !GridStore.exist?(@@db, 'foobar')
+    assert GridStore.exist?(@@db, 'bazqux')
+  end
 
   def test_append
     GridStore.open(@@db, 'foobar', 'w+') { |f| f.write(" how are you?") }