[TYPO3-english] Can't add new content column

[Olga Zhuravleva]

I want to have new content column.
I've made mark in template:
 <!--###CONTENT_BOTTOM###  start-->
<!--###CONTENT_BOTTOM###  stop-->
In TS add after    subparts.CONTENT < styles.content.get

subparts.CONTENT_BOTTOM < styles.content.get
subparts.CONTENT_BOTTOM.select.where = colPos = 1

But column doesn't appear at backend page list.
What's wrong?