yii\db\mssql\QueryBuilder::addCommentOnColumn PHP Method

    public function addCommentOnColumn($table, $column, $comment)
    {
        return "sp_updateextendedproperty @name = N'MS_Description', @value = {$this->db->quoteValue($comment)}, @level1type = N'Table',  @level1name = {$this->db->quoteTableName($table)}, @level2type = N'Column', @level2name = {$this->db->quoteColumnName($column)}";
    }