diff --git a/src/data/calendar/saints/st-jane-frances-de-chantal.yml b/src/data/calendar/saints/st-jane-frances-de-chantal.yml
index 4f2d3b8..4da685d 100644
--- a/src/data/calendar/saints/st-jane-frances-de-chantal.yml
+++ b/src/data/calendar/saints/st-jane-frances-de-chantal.yml
@@ -7,9 +7,11 @@
 # portugal.yml (no benedictus-antiphon-common-of-a-widow.yml exists).
 # No Lectio7-9 in her own file -- defers to the Common's own Nocturn 3,
 # not transcribed here.
+# Rank manually lowered from the reference engine's Duplex to semiduplex
+# per the user's own calendar (see "Not a reconstruction" in CLAUDE.md).
 id: st-jane-frances-de-chantal
 name: "St. Jane Frances de Chantal, Widow"
-rank: duplex
+rank: semiduplex
 common: common-of-a-widow
 propers: "st-jane-frances-de-chantal"
 benedictusCommon: common-of-a-virgin