Mention that crc32 and adler32 are available in a different module (zlib).

Some people look for them in hashlib.

Doc/library/hashlib.rst

@@ -21,6 +21,10 @@ algorithm (defined in Internet :rfc:`1321`). The terms secure hash and message
 digest are interchangeable.  Older algorithms were called message digests.  The
 modern term is secure hash.
 
+.. note::
+   If you want the adler32 or crc32 hash functions they are available in
+   the :mod:`zlib` module.
+
 .. warning::
 
    Some algorithms have known hash collision weaknesses, see the FAQ at the end.

Lib/hashlib.py

@@ -18,6 +18,9 @@ md5(), sha1(), sha224(), sha256(), sha384(), and sha512()
 More algorithms may be available on your platform but the above are
 guaranteed to exist.
 
+NOTE: If you want the adler32 or crc32 hash functions they are available in
+the zlib module.
+
 Choose your hash function wisely.  Some have known collision weaknesses.
 sha384 and sha512 will be slow on 32 bit platforms.