diff --git a/README_BUILD_FIRESTORM_WIN64.txt b/README_BUILD_FIRESTORM_WIN64.txt
index aa44b24907..923a869cb2 100755
--- a/README_BUILD_FIRESTORM_WIN64.txt
+++ b/README_BUILD_FIRESTORM_WIN64.txt
@@ -11,11 +11,7 @@ Make sure you're not building from a Visual Studio command prompt, or parts of t
 chain might accidentally pick up a 32 bit compiler, resulting in x86<>x64 mismatch.
 
 Configure/build is nearly the same as building a 32 bit version.
-autobuild -m64 configure -c ReleaseFS -- --chan <channel> --package -DFS_UPGRADECODES='<MSI_UPGRADE_CODE>,<EXE_UPGRADE_CODE>'
+autobuild -m64 configure -c ReleaseFS -- --chan <channel> --package
 autobuild -m64 build -c ReleaseFS --no-configure
 
 The resulting installer/exe gets created in build-vc120_x64/newview/Release
-
-GUIDs for the installer can be generated by either GuidGen, or a service like https://www.guidgenerator.com/
-make sure MSI_UPGRADE_CODE and EXE_UPGRADE_CODE are different.
-