diff --git a/icu4c/source/i18n/unicode/calendar.h b/icu4c/source/i18n/unicode/calendar.h
index 9be0a2bb8dc5..8a07c37b8925 100644
--- a/icu4c/source/i18n/unicode/calendar.h
+++ b/icu4c/source/i18n/unicode/calendar.h
@@ -1951,7 +1951,7 @@ class U_I18N_API Calendar : public UObject {
     /**
      * Pseudo-time-stamps which specify when each field was set. There
      * are two special values, UNSET and INTERNALLY_SET. Values from
-     * MINIMUM_USER_SET to 127 are legal user set values.
+     * MINIMUM_USER_SET to STAMP_MAX are legal user set values.
      */
     int8_t        fStamp[UCAL_FIELD_COUNT];