diff --git a/docs/guide/gridfs.rst b/docs/guide/gridfs.rst
index 503610c9..0cd06539 100644
--- a/docs/guide/gridfs.rst
+++ b/docs/guide/gridfs.rst
@@ -21,7 +21,7 @@ a document is created to store details about animals, including a photo::
     marmot = Animal('Marmota', 'Sciuridae')
 
     marmot_photo = open('marmot.jpg', 'r')      # Retrieve a photo from disk
-    marmot.photo = marmot_photo                 # Store the photo in the document
+    marmot.photo = marmot_photo                 # Store photo in the document
     marmot.photo.content_type = 'image/jpeg'    # Store metadata
 
     marmot.save()
@@ -40,7 +40,7 @@ Retrieval
 So using the :class:`~mongoengine.FileField` is just like using any other
 field. The file can also be retrieved just as easily::
 
-    marmot = Animal.objects('Marmota').first()
+    marmot = Animal.objects(genus='Marmota').first()
     photo = marmot.photo.read()
     content_type = marmot.photo.content_type
 
diff --git a/mongoengine/fields.py b/mongoengine/fields.py
index ef9540fc..e95fd65e 100644
--- a/mongoengine/fields.py
+++ b/mongoengine/fields.py
@@ -614,15 +614,10 @@ class GridFSProxy(object):
     def delete(self):
         # Delete file from GridFS, FileField still remains
         self.fs.delete(self.grid_id)
-
-        #self.grid_id = None
-        # Doesn't make a difference because will be put back in when
-        # reinstantiated We should delete all the metadata stored with the
-        # file too
+        self.grid_id = None
 
     def replace(self, file, **kwargs):
         self.delete()
-        self.grid_id = None
         self.put(file, **kwargs)
 
     def close(self):