diff --git a/custom_components/nestquest/core/const.py b/custom_components/nestquest/core/const.py
index 0ac9c17..6ebfe59 100644
--- a/custom_components/nestquest/core/const.py
+++ b/custom_components/nestquest/core/const.py
@@ -115,8 +115,12 @@ DEFAULT_AUTOMATION_ENABLED = True
 # The household's IANA time zone (e.g. ``America/New_York``) the API
 # service reads its clock in.  The empty string is the API host's own
 # local time.  Only an admin sets it (manually, from the admin app);
-# nothing sets it automatically.  The integration itself always uses
-# Home Assistant's ``time_zone`` and ignores this field.
+# nothing sets it automatically.  The integration relays the API's
+# effective application timezone (the coordinator carries it and the
+# household sensor publishes it for the panel cards) and never derives
+# the application clock from Home Assistant's configuration; the Home
+# Assistant / browser zone applies only when the API publishes no zone
+# (e.g. an older API).
 CONF_TIMEZONE = "timezone"
 DEFAULT_TIMEZONE = ""
 
diff --git a/custom_components/nestquest/core/materialize.py b/custom_components/nestquest/core/materialize.py
index 8e47217..fe37f2c 100644
--- a/custom_components/nestquest/core/materialize.py
+++ b/custom_components/nestquest/core/materialize.py
@@ -259,8 +259,8 @@ async def materialize(
     no-past guard compares against; it is threaded into every
     :meth:`~.dao_instances.QuestInstancesDao.upsert_if_valid` write.  When
     omitted the host clock (``datetime.date.today``) is used, which is the
-    historical default.  A caller that computed the horizon in Home
-    Assistant's configured time zone MUST pass that same date here so a
+    historical default.  A caller that computed the horizon in the
+    household's application time zone MUST pass that same date here so a
     time zone behind the host around midnight is not rejected as "past".
 
     ``start_date`` is clamped up to the resolved "today" (the same
@@ -415,7 +415,7 @@ async def regenerate_for_child(
     execution-day anchor even when the call is queued across midnight.
     ``today`` optionally pins a caller-resolved household-local date, threaded
     into the delete cutoff and the re-materialization for the same
-    host-vs-HA time-zone consistency.  ``horizon_days`` sizes the
+    host-vs-household time-zone consistency.  ``horizon_days`` sizes the
     re-materialization window; when omitted it falls back to
     :data:`~.const.DEFAULT_HORIZON_DAYS`.  A bool, non-int, or sub-1 value
     raises ValueError BEFORE any delete.  Returns the number of instances