diff --git a/checkin_notes b/checkin_notes
index 2f8034f1d4..03fd3c3b00 100644
--- a/checkin_notes
+++ b/checkin_notes
@@ -10020,3 +10020,9 @@ Charlie 13 Dec 2009
         app_control.cpp
         client_types.cpp
     
+Charlie 13 Dec 2009
+    Mac command-line install: add .txt extension to copyright files.
+    
+    mac_installer/
+        release_boinc.sh
+    
\ No newline at end of file
diff --git a/mac_installer/release_boinc.sh b/mac_installer/release_boinc.sh
index b83938e5a7..a45e06be8a 100644
--- a/mac_installer/release_boinc.sh
+++ b/mac_installer/release_boinc.sh
@@ -220,9 +220,9 @@ sudo chmod a+rw ../BOINC_Installer/New_Release_$1_$2_$3/boinc_$1.$2.$3_macOSX_un
 # Build the stand-alone client distribution
 cp -fpR mac_build/Mac_SA_Insecure.sh ../BOINC_Installer/New_Release_$1_$2_$3/boinc_$1.$2.$3_universal-apple-darwin/
 cp -fpR mac_build/Mac_SA_Secure.sh ../BOINC_Installer/New_Release_$1_$2_$3/boinc_$1.$2.$3_universal-apple-darwin/
-cp -fpR COPYING ../BOINC_Installer/New_Release_$1_$2_$3/boinc_$1.$2.$3_universal-apple-darwin/
-cp -fpR COPYING.LESSER ../BOINC_Installer/New_Release_$1_$2_$3/boinc_$1.$2.$3_universal-apple-darwin/
-cp -fpR COPYRIGHT ../BOINC_Installer/New_Release_$1_$2_$3/boinc_$1.$2.$3_universal-apple-darwin/
+cp -fpR COPYING ../BOINC_Installer/New_Release_$1_$2_$3/boinc_$1.$2.$3_universal-apple-darwin/COPYING.txt
+cp -fpR COPYING.LESSER ../BOINC_Installer/New_Release_$1_$2_$3/boinc_$1.$2.$3_universal-apple-darwin/COPYING.LESSER.txt
+cp -fpR COPYRIGHT ../BOINC_Installer/New_Release_$1_$2_$3/boinc_$1.$2.$3_universal-apple-darwin/COPYRIGHT.txt
 cp -fp mac_Installer/License.rtf ../BOINC_Installer/New_Release_$1_$2_$3/boinc_$1.$2.$3_universal-apple-darwin/
 sudo chown -R 501:admin ../BOINC_Installer/New_Release_$1_$2_$3/boinc_$1.$2.$3_universal-apple-darwin/*
 sudo chmod -R 644 ../BOINC_Installer/New_Release_$1_$2_$3/boinc_$1.$2.$3_universal-apple-darwin/*