diff --git a/OpenSSL/test/test_ssl.py b/OpenSSL/test/test_ssl.py
index b30bed4..6409b8e 100644
--- a/OpenSSL/test/test_ssl.py
+++ b/OpenSSL/test/test_ssl.py
@@ -280,6 +280,10 @@
 
 
     def _handshakeInMemory(self, client_conn, server_conn):
+        """
+        Perform the TLS handshake between two :py:class:`Connection` instances
+        connected to each other via memory BIOs.
+        """
         client_conn.set_connect_state()
         server_conn.set_accept_state()