private void ensureCommentsIsMutable() {
        if (!comments_.isModifiable()) {
          comments_ = new com.google.protobuf.LazyStringArrayList(comments_);
        }
        bitField0_ |= 0x00000002;
      }
<pre>
Labels associated with this URI that explain how it was classified.
</pre>

<code>
repeated .google.cloud.webrisk.v1.ThreatInfo.ThreatJustification.JustificationLabel labels = 1;
</code>

@param values The enum numeric values on the wire for labels to add.
@return This builder for chaining.
java-webrisk/proto-google-cloud-webrisk-v1/src/main/java/com/google/webrisk/v1/ThreatInfo.java