diff --git a/conn.go b/conn.go
index 9562ffd4..f687d78e 100644
--- a/conn.go
+++ b/conn.go
@@ -991,7 +991,7 @@ func (c *Conn) handleProtocolError(message string) error {
 	if len(data) > maxControlFramePayloadSize {
 		data = data[:maxControlFramePayloadSize]
 	}
-	// Make a best effor to send a close message describing the problem.
+	// Make a best effort to send a close message describing the problem.
 	_ = c.WriteControl(CloseMessage, data, time.Now().Add(writeWait))
 	return errors.New("websocket: " + message)
 }