1 files changed, 5 insertions, 5 deletions
diff --git a/Lib/asyncio/protocols.py b/Lib/asyncio/protocols.py
index dc298a8d5c9..b8d2e6be552 100644
--- a/Lib/asyncio/protocols.py
+++ b/Lib/asyncio/protocols.py
@@ -130,11 +130,15 @@ class BufferedProtocol(BaseProtocol):
     * CL: connection_lost()
     """
 
-    def get_buffer(self):
+    def get_buffer(self, sizehint):
         """Called to allocate a new receive buffer.
 
+        *sizehint* is a recommended minimal size for the returned
+        buffer.  When set to -1, the buffer size can be arbitrary.
+
         Must return an object that implements the
         :ref:`buffer protocol <bufferobjects>`.
+        It is an error to return a zero-sized buffer.
         """
 
     def buffer_updated(self, nbytes):
@@ -185,7 +189,3 @@ class SubprocessProtocol(BaseProtocol):
 
     def process_exited(self):
         """Called when subprocess has exited."""
-
-
-def _is_buffered_protocol(proto):
-    return hasattr(proto, 'get_buffer') and not hasattr(proto, 'data_received')