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-rw-r--r--docs/hazmat/backends/commoncrypto.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/docs/hazmat/backends/commoncrypto.rst b/docs/hazmat/backends/commoncrypto.rst
index 16a61337..d31391d7 100644
--- a/docs/hazmat/backends/commoncrypto.rst
+++ b/docs/hazmat/backends/commoncrypto.rst
@@ -3,7 +3,8 @@
CommonCrypto Backend
====================
-The `CommonCrypto`_ C library provided by Apple on OS X and iOS.
+The `CommonCrypto`_ C library provided by Apple on OS X and iOS. The CommonCrypto
+backend is only supported on OS X versions 10.8 and above.
.. currentmodule:: cryptography.hazmat.backends.commoncrypto.backend