diff --git a/onebusaway-gtfs/src/main/java/org/onebusaway/gtfs/model/StopTime.java b/onebusaway-gtfs/src/main/java/org/onebusaway/gtfs/model/StopTime.java
index a0d63c448..12d44dcd3 100644
--- a/onebusaway-gtfs/src/main/java/org/onebusaway/gtfs/model/StopTime.java
+++ b/onebusaway-gtfs/src/main/java/org/onebusaway/gtfs/model/StopTime.java
@@ -158,7 +158,8 @@ public boolean isArrivalTimeSet() {
   }
 
   /**
-   * @return arrival time, in seconds since midnight
+   * @return arrival time, in seconds since "noon minus 12h" (effectively midnight, except for days on which daylight
+   * savings time changes occur) at the beginning of the service date
    */
   public int getArrivalTime() {
     if (proxy != null) {
@@ -191,7 +192,8 @@ public boolean isDepartureTimeSet() {
   }
 
   /**
-   * @return departure time, in seconds since midnight
+   * @return departure time, in seconds since "noon minus 12h" (effectively midnight, except for days on which daylight
+   * savings time changes occur) at the beginning of the service date
    */
   public int getDepartureTime() {
     if (proxy != null) {
diff --git a/onebusaway-gtfs/src/main/java/org/onebusaway/gtfs/model/calendar/ServiceInterval.java b/onebusaway-gtfs/src/main/java/org/onebusaway/gtfs/model/calendar/ServiceInterval.java
index 92197f195..8e52462e5 100644
--- a/onebusaway-gtfs/src/main/java/org/onebusaway/gtfs/model/calendar/ServiceInterval.java
+++ b/onebusaway-gtfs/src/main/java/org/onebusaway/gtfs/model/calendar/ServiceInterval.java
@@ -34,8 +34,10 @@ public final class ServiceInterval implements Serializable {
 
   /**
    * 
-   * @param arrival arrival time in seconds since midnight
-   * @param departure departure time in seconds since midnight
+   * @param arrival arrival time in seconds since "noon minus 12h" (effectively midnight, except for days on which
+   * daylight savings time changes occur) at the beginning of the service date
+   * @param departure departure time in seconds since "noon minus 12h" (effectively midnight, except for days on which
+   * daylight savings time changes occur) at the beginning of the service date
    */
   public ServiceInterval(int arrival, int departure) {
     this(arrival, departure, arrival, departure);
@@ -58,7 +60,8 @@ public ServiceInterval(int minArrival, int minDeparture, int maxArrival,
 
   /**
    * 
-   * @return min arrival time in seconds since midnight
+   * @return min arrival time in seconds since "noon minus 12h" (effectively midnight, except for days on which daylight
+   * savings time changes occur) at the beginning of the service date
    */
   public int getMinArrival() {
     return minArrival;
@@ -66,7 +69,8 @@ public int getMinArrival() {
 
   /**
    * 
-   * @return min departure time in seconds since midnight
+   * @return min departure time in seconds since "noon minus 12h" (effectively midnight, except for days on which
+   * daylight savings time changes occur) at the beginning of the service date
    */
   public int getMinDeparture() {
     return minDeparture;
@@ -74,7 +78,8 @@ public int getMinDeparture() {
 
   /**
    * 
-   * @return max arrival time in seconds since midnight
+   * @return max arrival time in seconds since "noon minus 12h" (effectively midnight, except for days on which
+   * daylight savings time changes occur) at the beginning of the service date
    */
   public int getMaxArrival() {
     return maxArrival;
@@ -82,7 +87,8 @@ public int getMaxArrival() {
 
   /**
    * 
-   * @return max departure time in seconds since midnight
+   * @return max departure time in seconds since "noon minus 12h" (effectively midnight, except for days on which
+   * daylight savings time changes occur) at the beginning of the service date
    */
   public int getMaxDeparture() {
     return maxDeparture;