diff --git a/docs/x509/reference.rst b/docs/x509/reference.rst
index 9179468..4d164dc 100644
--- a/docs/x509/reference.rst
+++ b/docs/x509/reference.rst
@@ -431,6 +431,25 @@
             >>> isinstance(csr.signature_hash_algorithm, hashes.SHA1)
             True
 
+    .. attribute:: extensions
+
+        :type: :class:`Extensions`
+
+        The extensions encoded in the certificate signing request.
+
+        :raises cryptography.x509.DuplicateExtension: If more than one
+            extension of the same type is found within the certificate siging request.
+
+        :raises cryptography.x509.UnsupportedExtension: If the certificate siging request
+            contains an extension that is not supported.
+
+        :raises cryptography.x509.UnsupportedGeneralNameType: If an extension
+            contains a general name that is not supported.
+
+        :raises UnicodeError: If an extension contains IDNA encoding that is
+            invalid or not compliant with IDNA 2008.
+
+
     .. method:: public_bytes(encoding)
 
         .. versionadded:: 1.0