* @invariant This function is only called on a Leader.
*
* @param m An update message
- * @returns 'true' if the update message was handled (e.g., a command that
- * went through); 'false' otherwise.
+ * @returns 'true' if the pending state should be proposed; 'false' otherwise.
*/
virtual bool prepare_update(MonOpRequestRef op) = 0;
/**