code: public DescribeReservedInstancesModificationsRequest withReservedInstancesModificationIds(String... reservedInstancesModificationIds) {
          if (this.reservedInstancesModificationIds == null) {
              setReservedInstancesModificationIds(new com.amazonaws.internal.SdkInternalList<String>(reservedInstancesModificationIds.length));
          }
          for (String ele : reservedInstancesModificationIds) {
              this.reservedInstancesModificationIds.add(ele);
          }
          return this;
      }
docs: <p>
  IDs for the submitted modification request.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setReservedInstancesModificationIds(java.util.Collection)} or
  {@link #withReservedInstancesModificationIds(java.util.Collection)} if you want to override the existing values.
  </p>
  
  @param reservedInstancesModificationIds
  IDs for the submitted modification request.
  @return Returns a reference to this object so that method calls can be chained together.