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-rw-r--r--Doc/library/zipfile.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/Doc/library/zipfile.rst b/Doc/library/zipfile.rst
index f647bca..c90f946 100644
--- a/Doc/library/zipfile.rst
+++ b/Doc/library/zipfile.rst
@@ -19,7 +19,8 @@ added to individual archive members---for which see the :ref:`zipinfo-objects`
documentation). It can handle ZIP files that use the ZIP64 extensions
(that is ZIP files that are more than 4 GByte in size). It supports
decryption of encrypted files in ZIP archives, but it currently cannot
-create an encrypted file.
+create an encrypted file. Decryption is extremely slow as it is
+implemented in native python rather than C.
For other archive formats, see the :mod:`bz2`, :mod:`gzip`, and
:mod:`tarfile` modules.