(Time Conversion): For encode-time, explain limits on year.

diff --git a/lispref/os.texi b/lispref/os.texi
index 3536c086f1f0c4fc70a5ef63a2b2740725618457..9453ae666c9e2e55ab96e979f35fcede06ae5934 100644 (file)
--- a/lispref/os.texi
+++ b/lispref/os.texi
@@ -1233,6 +1233,8 @@ arguments; for example, day 0 means the day preceding the given month.
 
 The operating system puts limits on the range of possible time values;
 if you try to encode a time that is out of range, an error results.
+For instance, years before 1970 do not work on some systems;
+on others, years as early as 1901 do work.
 @end defun
 
 @node Time Calculations