3.2 - Fix closes Issue6090 - Raise a ValueError, instead of failing with unrelated
exceptions, when a document with timestamp earlier than 1980 is provided to
zipfile. Patch contributed by  Petri Lehtinen.
diff --git a/Doc/library/zipfile.rst b/Doc/library/zipfile.rst
index 019a894..6f84bcc 100644
--- a/Doc/library/zipfile.rst
+++ b/Doc/library/zipfile.rst
@@ -398,7 +398,7 @@
    +-------+--------------------------+
    | Index | Value                    |
    +=======+==========================+
-   | ``0`` | Year                     |
+   | ``0`` | Year (>= 1980)           |
    +-------+--------------------------+
    | ``1`` | Month (one-based)        |
    +-------+--------------------------+
@@ -411,6 +411,10 @@
    | ``5`` | Seconds (zero-based)     |
    +-------+--------------------------+
 
+   .. note::
+
+      The ZIP file format does not support timestamps before 1980.
+
 
 .. attribute:: ZipInfo.compress_type