diff --git a/example.config.xml b/example.config.xml
index e8e1c5d..2f27f1f 100644
--- a/example.config.xml
+++ b/example.config.xml
@@ -2,6 +2,7 @@
 <!--
   This is by default placed in ~/.config/repomirror.xml
   Remember to replace any necessary special characters (https://stackoverflow.com/a/1091953/733214).
+  Also, your mirror server should definitely be using UTC. You're going to see a LOT of weirdness if not.
 -->
 <mirror xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="https://git.square-r00t.net/RepoMirror/"
@@ -121,8 +122,8 @@
       You can optionally specify an offset via the "offset" attribute in the same format as "delayCheck" if your
       upstream's remote files are using a different timezone instead of UTC.
       e.g.:
-        * If your upstream uses UTC-4 for its timestamp files', you would use "-PT4H".
-        * If your upstream uses UTC+6 for its timestamp files, you would use either "+PT4H" or just "PT4H".
+        * If your upstream uses UTC-4 for its timestamp files, you would use "-PT4H".
+        * If your upstream uses UTC+6 for its timestamp files, you would use either "+PT6H" or just "PT6H".
     -->
     <upstream delayCheck="P0Y0M2DT0H0M0S" offset="-PT0S">
       <!--
diff --git a/requirements.txt b/requirements.txt
index 72951be..99a5a36 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,10 @@
 lxml>=4.5.1
 psutil>=5.7.0
 requests>=2.23.0
+## TODO: support non-UTC local timezone.
+# https://stackoverflow.com/questions/13218506/how-to-get-system-timezone-setting-and-pass-it-to-pytz-timezone
+# https://stackoverflow.com/questions/5067218/get-utc-timestamp-in-python-with-datetime
+#tzlocal>=2.1
 # The below are optional.
 ## Provides journald logging on systemd machines.
 ## However, it isn't in PyPi; look for something like "python-systemd" or "python3-systemd" in your distro's repositories (it's built from the systemd source).