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-rw-r--r--docs/hazmat/primitives/cryptographic-hashes.rst4
1 files changed, 3 insertions, 1 deletions
diff --git a/docs/hazmat/primitives/cryptographic-hashes.rst b/docs/hazmat/primitives/cryptographic-hashes.rst
index 49288326..ff31b779 100644
--- a/docs/hazmat/primitives/cryptographic-hashes.rst
+++ b/docs/hazmat/primitives/cryptographic-hashes.rst
@@ -90,7 +90,9 @@ SHA-1
.. class:: SHA1()
SHA-1 is a cryptographic hash function standardized by NIST. It produces an
- 160-bit message digest.
+ 160-bit message digest. Cryptanalysis of SHA-1 has demonstrated that it is
+ vulnerable to practical collision attacks, though no actual collisions are
+ publicly known.
SHA-2 family
~~~~~~~~~~~~