code: public ListCertificateAuthoritiesResult withCertificateAuthorities(CertificateAuthority... certificateAuthorities) {
          if (this.certificateAuthorities == null) {
              setCertificateAuthorities(new java.util.ArrayList<CertificateAuthority>(certificateAuthorities.length));
          }
          for (CertificateAuthority ele : certificateAuthorities) {
              this.certificateAuthorities.add(ele);
          }
          return this;
      }
docs: <p>
  Summary information about each certificate authority you have created.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setCertificateAuthorities(java.util.Collection)} or
  {@link #withCertificateAuthorities(java.util.Collection)} if you want to override the existing values.
  </p>
  
  @param certificateAuthorities
  Summary information about each certificate authority you have created.
  @return Returns a reference to this object so that method calls can be chained together.