diff --git a/widgets/mainwindow.cpp b/widgets/mainwindow.cpp
index 664208252..6124be448 100644
--- a/widgets/mainwindow.cpp
+++ b/widgets/mainwindow.cpp
@@ -943,17 +943,17 @@ void MainWindow::not_GA_warning_message ()
   QDateTime timeout=QDateTime(QDate(2018,12,31));
 
   MessageBox::critical_message (this,
-                                "This version of WSJT-X is a beta-level Release Candidate.\n\n"
-                                "In FT8 and MSK144 modes it uses ONLY the new 77-bit\n"
-                                "message formats. It will not decode 75-bit or 72-bit\n"
-                                "messages.\n\n"
-                                "On December 10, 2018, 77-bit messages will become the\n"
-                                "standard. Everyone should upgrade to WSJT-X 2.0 by\n"
-                                "January 1, 2019.\n\n"
-                                "On-the-air use carries an obligation to report problems\n"
-                                "to the WSJT Development group and to upgrade to a GA\n"
-                                "(General Availability) release when it becomes available.\n\n"
-                                "This version cannot be used after December 31, 2018.\n\n");
+       "This version of WSJT-X is a beta-level Release Candidate.\n\n"
+       "IMPORTANT: WSJT-X 2.0 cannot communicate with other\n"
+       "stations using the FT8 or MSK144 protocols in WSJT-X v1.9.1\n"
+       "or earlier.\n\n"
+       "On December 10, 2018, the new FT8 and MSK144 protocols\n"
+       "will become the standard. Everyone should upgrade to\n"
+       "WSJT-X 2.0 by January 1, 2019.\n\n"
+       "On-the-air use carries an obligation to report problems\n"
+       "to the WSJT Development group and to upgrade to a GA\n"
+       "(General Availability) release when it becomes available.\n\n"
+       "This version cannot be used after December 31, 2018.\n\n");
 
   if(now.daysTo(timeout) < 0) Q_EMIT finished();
 }