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diff --git a/NOTICE b/NOTICE
index 7c3b4d2..93491e3 100644
--- a/NOTICE
+++ b/NOTICE
@@ -10,3 +10,9 @@ General Roman Calendar. The data as committed here is lectio's own, maintained
 independently.
 
 romcal — Copyright (c) romcal contributors — MIT License.
+
+Extraordinary Form (1962) calendar data
+---------------------------------------
+The 1962 calendar data in internal/caldata/tridentine-calendar.ini was
+bootstrapped with reference to Divinum Officium (https://divinumofficium.com)
+and the Missal1962 / tridentine_calendar projects, and is lectio's own.