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-rw-r--r--docs/hazmat/backends/openssl.rst4
-rw-r--r--docs/hazmat/bindings/commoncrypto.rst4
-rw-r--r--docs/hazmat/bindings/openssl.rst4
3 files changed, 8 insertions, 4 deletions
diff --git a/docs/hazmat/backends/openssl.rst b/docs/hazmat/backends/openssl.rst
index d6351c9c..547fe769 100644
--- a/docs/hazmat/backends/openssl.rst
+++ b/docs/hazmat/backends/openssl.rst
@@ -3,7 +3,9 @@
OpenSSL Backend
===============
-The `OpenSSL`_ C library.
+The `OpenSSL`_ C library. Cryptography supports version ``0.9.8e`` (present in
+Red Hat Enterprise Linux 5) and greater. Earlier versions may work but are
+**not tested or supported**.
.. data:: cryptography.hazmat.backends.openssl.backend
diff --git a/docs/hazmat/bindings/commoncrypto.rst b/docs/hazmat/bindings/commoncrypto.rst
index 50dbe69a..e5a673b3 100644
--- a/docs/hazmat/bindings/commoncrypto.rst
+++ b/docs/hazmat/bindings/commoncrypto.rst
@@ -7,8 +7,8 @@ CommonCrypto Binding
.. versionadded:: 0.2
-These are `CFFI`_ bindings to the `CommonCrypto`_ C library. It is available on
-Mac OS X.
+These are `CFFI`_ bindings to the `CommonCrypto`_ C library. It is only
+available on Mac OS X versions 10.8 and above.
.. class:: cryptography.hazmat.bindings.commoncrypto.binding.Binding()
diff --git a/docs/hazmat/bindings/openssl.rst b/docs/hazmat/bindings/openssl.rst
index 557f8c4d..9fce8f77 100644
--- a/docs/hazmat/bindings/openssl.rst
+++ b/docs/hazmat/bindings/openssl.rst
@@ -5,7 +5,9 @@ OpenSSL Binding
.. currentmodule:: cryptography.hazmat.bindings.openssl.binding
-These are `CFFI`_ bindings to the `OpenSSL`_ C library.
+These are `CFFI`_ bindings to the `OpenSSL`_ C library. Cryptography supports
+version ``0.9.8e`` (present in Red Hat Enterprise Linux 5) and greater. Earlier
+versions may work but are **not tested or supported**.
.. class:: cryptography.hazmat.bindings.openssl.binding.Binding()