Javadocs on private and protected elements are required to contain a short summary line. This is often the only part of the Javadoc that others will see surfaced in various tools.

/** @return deserialised proto */
public Proto parse(byte[] bytes) {
  ...
}

/** Returns deserialised proto. */
public Proto parse(byte[] bytes) {
  ...
}

Suppression

Suppress by applying @SuppressWarnings("MissingSummary") to the element being documented.