code: public void update(Tag.Builder tag, String channelName)	throws ChannelFinderException {
  		wrappedSubmit(new UpdateTag(tag.toXml(), channelName));
  	}
docs: Update Tag <tt>tag </tt> by adding it to Channel with name
  <tt>channelName</tt>, without affecting the other instances of this tag.
  
  @param tag
  the tag to be added
  @param channelName
  Name of the channel to which the tag is to be added
  @throws ChannelFinderException - channelfinder exception