code: public ValidDBInstanceModificationsMessage withStorage(ValidStorageOptions... storage) {
          if (this.storage == null) {
              setStorage(new com.amazonaws.internal.SdkInternalList<ValidStorageOptions>(storage.length));
          }
          for (ValidStorageOptions ele : storage) {
              this.storage.add(ele);
          }
          return this;
      }
docs: <p>
  Valid storage options for your DB instance.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setStorage(java.util.Collection)} or {@link #withStorage(java.util.Collection)} if you want to override
  the existing values.
  </p>
  
  @param storage
  Valid storage options for your DB instance.
  @return Returns a reference to this object so that method calls can be chained together.