diff --git a/src/timesync.cpp b/src/timesync.cpp
index 1d3034c3..ef50041d 100644
--- a/src/timesync.cpp
+++ b/src/timesync.cpp
@@ -211,11 +211,14 @@ int recv_timesync_ans(uint8_t seq_no, uint8_t buf[], uint8_t buf_len) {
 void IRAM_ATTR setMyTime(uint32_t t_sec, uint16_t t_msec,
                          timesource_t mytimesource) {
 
+  // increment t_sec only if t_msec > 1000
   time_t time_to_set = (time_t)(t_sec + t_msec / 1000);
 
+  // do we have a valid time?
   if (timeIsValid(time_to_set)) {
 
-    // wait until top of second with millisecond precision
+    // if we have msec fraction, then wait until top of second with
+    // millisecond precision
     if (t_msec % 1000) {
       time_to_set++;
       vTaskDelay(pdMS_TO_TICKS(1000 - t_msec % 1000));
@@ -224,13 +227,14 @@ void IRAM_ATTR setMyTime(uint32_t t_sec, uint16_t t_msec,
     ESP_LOGD(TAG, "[%0.3f] UTC epoch time: %d.%03d sec", millis() / 1000.0,
              time_to_set, t_msec % 1000);
 
-// if we got a timesource, set RTC time and RTC_INT pulse on top of second
+// if we have got an external timesource, set RTC time and shift RTC_INT pulse
+// to top of second
 #ifdef HAS_RTC
     if ((mytimesource == _gps) || (mytimesource == _lora))
       set_rtctime(time_to_set);
 #endif
 
-// sync pps timer to top of second
+// if we have a software pps timer, shift it to top of second
 #if (!defined GPS_INT && !defined RTC_INT)
     timerWrite(ppsIRQ, 0); // reset pps timer
     CLOCKIRQ();            // fire clock pps, this advances time 1 sec