typo
diff --git a/docs/hazmat/backends/openssl.rst b/docs/hazmat/backends/openssl.rst
index 79fa0b3..d6351c9 100644
--- a/docs/hazmat/backends/openssl.rst
+++ b/docs/hazmat/backends/openssl.rst
@@ -63,7 +63,7 @@
utilizes the `Yarrow`_ algorithm.
On Windows the implementation of ``CryptGenRandom`` depends on which version of
-the operation sytem you are using. See the `Microsoft documentation`_ for more
+the operation system you are using. See the `Microsoft documentation`_ for more
details.
Linux uses its own PRNG design. ``/dev/urandom`` is a non-blocking source seeded