   getInvalidationStrategy: ->
     @bufferMarker.getInvalidationStrategy()
 
-  # Extended: Returns an {Object} containing any custom properties associated with
+  # Essential: Returns an {Object} containing any custom properties associated with
   # the marker.
   getProperties: ->
     @bufferMarker.getProperties()

#
# ### Marker Creation
#
# You will use {Editor::markBufferRange} rather than creating Markers directly.
#
# ### Head and Tail
#

  isDestroyed: ->
    @bufferMarker.isDestroyed()

  # Essential: Returns a {Boolean} indicating whether the head precedes the tail.
  isReversed: ->
    @bufferMarker.isReversed()

  # Essential: Get the invalidation strategy for this marker.
  #
  # Valid values include: `never`, `surround`, `overlap`, `inside`, and `touch`.
  #
