Modify misleading comment on leap seconds.

1 files changed, 7 insertions, 2 deletions

diff --git a/timehint.c b/timehint.c
index abe15b57..d6bd5d98 100644
--- a/timehint.c
+++ b/timehint.c
@@ -315,10 +315,15 @@ static void chrony_send(struct gps_device_t *session, struct timedelta_t *td)
     struct tm tm;
     int leap_notify = session->context->leap_notify;
 
-    /* insist that leap seconds only happen in june and december
+    /*
+     * insist that leap seconds only happen in june and december
      * GPS emits leap pending for 3 months prior to insertion
      * NTP expects leap pending for only 1 month prior to insertion
-     * Per http://bugs.ntp.org/1090 */
+     * Per http://bugs.ntp.org/1090
+     *
+     * ITU-R TF.460-6, Section 2.1, says lappe seconds can be primarily
+     * in Jun/Dec but may be in March or September
+     */
     (void)gmtime_r( &(td->real.tv_sec), &tm);
     if ( 5 != tm.tm_mon && 11 != tm.tm_mon ) {
         /* Not june, not December, no way */