diff --git a/mac_build/HowToBuildBOINC_XCode.rtf b/mac_build/HowToBuildBOINC_XCode.rtf
index 76e5de7cb9..5043164c90 100644
--- a/mac_build/HowToBuildBOINC_XCode.rtf
+++ b/mac_build/HowToBuildBOINC_XCode.rtf
@@ -295,7 +295,7 @@ You will now have the following directory structure:\
 	                Screen Savers\
 	                        BOINCSaver.saver\
 \
-(6) From the Finder, open [boincpath]/mac_installer/BOINC.pmproj.  it will open in the PackageMaker application.  In the Files tab, set the path to your Pkg_Root directory.  in the Resources tab, set the path to your Installer_Resources directory.   Update the  version number in multiple places in the Description and Version tabs.\
+(6) From the Finder, open [boincpath]/mac_installer/BOINC.pmproj (if running OS 10.3, use BOINC.pmsp).  it will open in the PackageMaker application.  In the Files tab, set the path to your Pkg_Root directory.  in the Resources tab, set the path to your Installer_Resources directory.   Update the  version number in multiple places in the Description and Version tabs.\
 \
 (7) Select "Create Package" from PackageMaker's File menu.  You can give any name you wish to the installer package when you create it, but do 
 \f0\b not