title: Modify site column(type text) to allow more than 255 characters
body: <p>I have created custom site column with type text and I included in one of content types. But it is allowing me for 255 characters only. In which way I can extend it, say 1024 characters. I did this before by mentioning somewhere in web.config file but I forgot how i did.</p>
  
  <p>Can anyone please tell me how can I achieve this. Thanks in advance.</p>