2 files changed, 3 insertions, 2 deletions

diff --git a/doc/lispref/os.texi b/doc/lispref/os.texi
index 0b9dd1c9cc3..43ca9ede00b 100644
--- a/doc/lispref/os.texi
+++ b/doc/lispref/os.texi
@@ -1423,7 +1423,8 @@ The year, an integer typically greater than 1900.
 The day of week, as an integer between 0 and 6, where 0 stands for
 Sunday.
 @item dst
-@code{t} if daylight saving time is effect, otherwise @code{nil}.
+@code{t} if daylight saving time is effect, @code{nil} if it is not
+in effect, and @minus{}1 if this information is not available.
 @item utcoff
 An integer indicating the Universal Time offset in seconds, i.e., the number of
 seconds east of Greenwich.
diff --git a/doc/misc/emacs-mime.texi b/doc/misc/emacs-mime.texi
index b71cc3755bf..45f37fb8557 100644
--- a/doc/misc/emacs-mime.texi
+++ b/doc/misc/emacs-mime.texi
@@ -1535,7 +1535,7 @@ Here's a bunch of time/date/second/day examples:
 
 @example
 (parse-time-string "Sat Sep 12 12:21:54 1998 +0200")
-@result{} (54 21 12 12 9 1998 6 nil 7200)
+@result{} (54 21 12 12 9 1998 6 -1 7200)
 
 (date-to-time "Sat Sep 12 12:21:54 1998 +0200")
 @result{} (13818 19266)