diff --git a/reference/calendar/functions/jdtounix.xml b/reference/calendar/functions/jdtounix.xml
index e80d059bc4..de7f2a1dfd 100644
--- a/reference/calendar/functions/jdtounix.xml
+++ b/reference/calendar/functions/jdtounix.xml
@@ -18,7 +18,7 @@
    <parameter>jday</parameter> is not inside the Unix epoch
    (Gregorian years between 1970 and 2037 or 2440588 &lt;=
    <parameter>jday</parameter> &lt;= 2465342 ). The time returned is
-   localtime (and not GMT).
+   UTC.
   </para>
  </refsect1>
 
diff --git a/reference/calendar/functions/unixtojd.xml b/reference/calendar/functions/unixtojd.xml
index 17568d6f6b..421327d3dd 100644
--- a/reference/calendar/functions/unixtojd.xml
+++ b/reference/calendar/functions/unixtojd.xml
@@ -15,7 +15,8 @@
   <para>
    Return the Julian Day for a Unix <parameter>timestamp</parameter>
    (seconds since 1.1.1970), or for the current day if no
-   <parameter>timestamp</parameter> is given.
+   <parameter>timestamp</parameter> is given. Either way, the time is regarded
+   as local time (not UTC).
   </para>
  </refsect1>