code: public function addCommentOnColumn($table, $column, $comment)
      {
          $time = $this->beginCommand("add comment on column $column");
          $this->db->createCommand()->addCommentOnColumn($table, $column, $comment)->execute();
          $this->endCommand($time);
      }
docs: Builds and execute a SQL statement for adding comment to column.
  
  @param string $table the table whose column is to be commented. The table name will be properly quoted by the method.
  @param string $column the name of the column to be commented. The column name will be properly quoted by the method.
  @param string $comment the text of the comment to be added. The comment will be properly quoted by the method.
  @since 2.0.8