@@ -287,17 +287,21 @@
 - (OFString*)localDateStringWithFormat: (OFConstantString*)format;
 
 /*!
  * @brief Returns the earlier of the two dates.
  *
+ * If the argument is nil, it returns the receiver.
+ *
  * @param otherDate Another date
  * @return The earlier date of the two dates
  */
 - (OFDate*)earlierDate: (OFDate*)otherDate;
 
 /*!
  * @brief Returns the later of the two dates.
+ *
+ * If the argument is nil, it returns the receiver.
  *
  * @param otherDate Another date
  * @return The later date of the two dates
  */
 - (OFDate*)laterDate: (OFDate*)otherDate;