diff --git a/3rdParty/buildMacDependencies.sh b/3rdParty/buildMacDependencies.sh
index 1035de2e73..0d35063bc1 100755
--- a/3rdParty/buildMacDependencies.sh
+++ b/3rdParty/buildMacDependencies.sh
@@ -2,7 +2,7 @@
 
 # This file is part of BOINC.
 # http://boinc.berkeley.edu
-# Copyright (C) 2017 University of California
+# Copyright (C) 2021 University of California
 #
 # BOINC is free software; you can redistribute it and/or modify it
 # under the terms of the GNU Lesser General Public License
@@ -18,6 +18,9 @@
 # along with BOINC.  If not, see <http://www.gnu.org/licenses/>.
 #
 
+## IMPORTANT: This script is used only by GitHub Continuous Integration. Do not use it for 
+## building BOINC on a Macintosh computer! Use mac_build/setupForBOINC.sh instead.
+
 ## support script to build BOINC dependencies on Macintosh
 ## This script checks if cached versions are available and builts them if not.
 ## The build is done in 3rdParty/mac and usable files are installed to 3rdParty/buildCache/mac