From 7f53f06a6f54ef57e1a46b7708bc842e2d8e4dc8 Mon Sep 17 00:00:00 2001
From: Max Schmeller <6088931+mojomex@users.noreply.github.com>
Date: Thu, 6 Jun 2024 15:41:26 +0900
Subject: [PATCH] chore(watchdog_timer): add explanatory comment

---
 nebula_ros/include/nebula_ros/common/watchdog_timer.hpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/nebula_ros/include/nebula_ros/common/watchdog_timer.hpp b/nebula_ros/include/nebula_ros/common/watchdog_timer.hpp
index a5b2c2b75..522f9a32d 100644
--- a/nebula_ros/include/nebula_ros/common/watchdog_timer.hpp
+++ b/nebula_ros/include/nebula_ros/common/watchdog_timer.hpp
@@ -36,6 +36,8 @@ class WatchdogTimer
   {
     uint64_t now_ns = node_.get_clock()->now().nanoseconds();
 
+    // As the clock is not steady, the update timestamp can be newer than clock.now().
+    // Define that edge-case as not being late too.
     bool is_late = (last_update_ns_ > now_ns)
                      ? false
                      : (now_ns - last_update_ns_) > expected_update_interval_ns_;