diff --git a/docs/hazmat/backends/commoncrypto.rst b/docs/hazmat/backends/commoncrypto.rst
index af2032b..7bf1bc4 100644
--- a/docs/hazmat/backends/commoncrypto.rst
+++ b/docs/hazmat/backends/commoncrypto.rst
@@ -11,7 +11,14 @@
 
 .. data:: cryptography.hazmat.backends.commoncrypto.backend
 
-    This is the exposed API for the CommonCrypto backend. It has one public attribute.
+    This is the exposed API for the CommonCrypto backend.
+
+    * :class:`~cryptography.hazmat.backends.interfaces.CipherBackend`
+    * :class:`~cryptography.hazmat.backends.interfaces.HashBackend`
+    * :class:`~cryptography.hazmat.backends.interfaces.HMACBackend`
+    * :class:`~cryptography.hazmat.backends.interfaces.PBKDF2HMACBackend`
+
+    It has one additional public attribute.
 
     .. attribute:: name
 
diff --git a/docs/hazmat/backends/openssl.rst b/docs/hazmat/backends/openssl.rst
index 12d2d9f..4db3972 100644
--- a/docs/hazmat/backends/openssl.rst
+++ b/docs/hazmat/backends/openssl.rst
@@ -7,7 +7,16 @@
 
 .. data:: cryptography.hazmat.backends.openssl.backend
 
-    This is the exposed API for the OpenSSL backend. It has one public attribute.
+    This is the exposed API for the OpenSSL backend.
+
+    It implements the following interfaces:
+
+    * :class:`~cryptography.hazmat.backends.interfaces.CipherBackend`
+    * :class:`~cryptography.hazmat.backends.interfaces.HashBackend`
+    * :class:`~cryptography.hazmat.backends.interfaces.HMACBackend`
+    * :class:`~cryptography.hazmat.backends.interfaces.PBKDF2HMACBackend`
+
+    It has one additional public attribute.
 
     .. attribute:: name