diff --git a/doc/man7/timew-dates.7.adoc b/doc/man7/timew-dates.7.adoc
index c1122a39..0488e13b 100644
--- a/doc/man7/timew-dates.7.adoc
+++ b/doc/man7/timew-dates.7.adoc
@@ -62,7 +62,7 @@ In addition to the standard date formats, the following are supported:
   <month-of-year>                       Previous 1st of the  month at 0:00:00
   hh:mm[:ss][am|a|pm|p]                 Short time format
   Nst, Nnd, Nrd, Nth                    Previous 1st, 2nd, 3rd ...
-  <epoch>                               POSIX time (at least 315532800)
+  <epoch>                               POSIX time (at least 315532800, that is 1980-01-01)
   later                                 2038-01-18T0:00:00 (Y2K38)
   someday                               2038-01-18T0:00:00 (Y2K38)
   sopd, eopd                            Start/end of previous day
@@ -99,6 +99,9 @@ For times, the following are also possible:
   monday
   august
 
+== NOTES
+The minimum value for the POSIX time format was chosen to avoid confusion with ISO dates in the YYYYMMDD format.
+
 == SEE ALSO
 **timew-durations**(7),
 **timew-hints**(7)