diff --git a/checkin_notes b/checkin_notes
index e13f715937..f904a174ff 100644
--- a/checkin_notes
+++ b/checkin_notes
@@ -6306,6 +6306,13 @@ Charlie 16 Sept 2009
     mac_installer/
         PostInstall.cpp
 
+Charlie 17 Sept 2009
+    - Mac installer: Updated ReadMe file to explain changes for Unicode and for 
+        OS 10.6 Snow Leopard.
+        
+    mac_installer/
+        PTP-ReadMe.rtf
+
 Rom    25 Sept 2009
     - win_build: In the future be very careful about with project
         you choose to be the basis for a new executable.
diff --git a/mac_installer/PTP-ReadMe.rtf b/mac_installer/PTP-ReadMe.rtf
index bfebe343e9..c88f903e32 100644
--- a/mac_installer/PTP-ReadMe.rtf
+++ b/mac_installer/PTP-ReadMe.rtf
@@ -1,4 +1,4 @@
-{\rtf1\ansi\ansicpg1252\cocoartf949\cocoasubrtf460
+{\rtf1\ansi\ansicpg1252\cocoartf949\cocoasubrtf540
 {\fonttbl\f0\fswiss\fcharset0 Helvetica;}
 {\colortbl;\red255\green255\blue255;}
 \margl1440\margr1440\vieww9000\viewh9000\viewkind0
@@ -12,6 +12,14 @@
 \cf0 http://gridrepublic.org\
 \pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\ql\qnatural
 \cf0 \
+If you are upgrading from a version earlier than 6.8.0, you may see a message "Failed to convert file BOINC Manager Preferences to Unicode."  This is due to our addition of full Unicode support to the BOINC Manager.  If you get this message, you may need to readjust your column widths and other BOINC Manager view options, but no other problems will result.  When  you quit BOINC Manager, these settings will be saved in the new Unicode format.\
+\
+Due to new restrictions imposed by OS 10.6 Snow Leopard, there has been a change in BOINC's security implementation.  Non-administrative users can no longer run BOINC Manager unless they are added to group boinc_master.  As of BOINC 6.10.5, the BOINC installer asks whether or not you wish to allow this.\
+\
+For more options, please see the BOINC Macintosh administrator tools at:\
+\pard\tx720\tx1440\tx2160\tx2880\tx3600\tx4320\tx5040\tx5760\tx6480\tx7200\tx7920\tx8640\ql\qnatural
+{\field{\*\fldinst{HYPERLINK "http://boinc.berkeley.edu/wiki/Tools_for_Mac_OS_X"}}{\fldrslt \cf0 http://boinc.berkeley.edu/wiki/Tools_for_Mac_OS_X}}\
+\
 Starting with version 5.5.4, this software features new, stricter security measures.  See the 
 \b Security
 \b0  section below for important information.\