diff --git a/Release_Notes.txt b/Release_Notes.txt
index 1975229d8..92a6fcce6 100644
--- a/Release_Notes.txt
+++ b/Release_Notes.txt
@@ -12,7 +12,7 @@
                                                          
 Copyright 2001 - 2020 by Joe Taylor, K1JT.
 
-		   Release: WSJT-X 2.2.0-rc1
+		   Release: WSJT-X 2.2.0-rc2
 		          May 25, 2020
 		   -------------------------
 
@@ -27,13 +27,17 @@ following bugs in earlier program versions have been fixed:
  - Many fixes to hamlib library and executables (rigctld, etc.).
  - Some regional settings did not allow WSJT-X to start.
  - Main window "looked like old Windows" in macOS.
- - Updated figures and some new text in User Guide.
- - Some formatting issues in the pdf version of User Guide.
  - Crash when "Ref Spec" is selected and no refspec.dat available.
+
+In addition, we have made the following improvements:
+
+ - Updated figures and some new text in User Guide.
+ - Corrected some formatting issues in the pdf version of User Guide.
  - Added some new sample files.
  - Improved shape and position of "green goal post" in Wide Graph.
+ - Significantly reduced the rate of false FT8 decodes.
 
-See the next section for a list of program improvements since
+See the next section for a list of major program improvements since
 WSJT-X 2.1.2.
 
 
diff --git a/lib/77bit/packjt77.f90 b/lib/77bit/packjt77.f90
index 6be8a0841..e88153193 100644
--- a/lib/77bit/packjt77.f90
+++ b/lib/77bit/packjt77.f90
@@ -533,6 +533,10 @@ subroutine unpack77(c77,nrx,msg,unpk77_success)
 ! EU VHF contest
      read(c77,1060) n12,n22,ir,irpt,iserial,igrid6
 1060 format(b12,b22,b1,b3,b11,b25)
+     if(igrid6.lt.0 .or. igrid6.gt.18662399) then
+        unpk77_success=.false.
+        return
+     endif
      call hash12(n12,call_1)
      if(n12.eq.hashmy12) call_1='<'//trim(mycall13)//'>'
      call hash22(n22,call_2)