diff --git a/Mac/scripts/BuildApplet.py b/Mac/scripts/BuildApplet.py
index 52a7d0f..64a3d5e 100644
--- a/Mac/scripts/BuildApplet.py
+++ b/Mac/scripts/BuildApplet.py
@@ -75,6 +75,8 @@
 			elif opt in ('-n', '--noargv'):
 				raw = 1
 			elif opt in ('-e', '--extra'):
+				if ':' in arg:
+					arg = arg.split(':')
 				extras.append(arg)
 			elif opt in ('-v', '--verbose'):
 				verbose = Verbose()
@@ -99,12 +101,12 @@
 	print "  BuildApplet src1.py src2.py ...   non-interactive multiple file"
 	print "  BuildApplet [options] src.py    non-interactive single file"
 	print "Options:"
-	print "  --output o    Output file; default based on source filename, short -o"
-	print "  --resource r  Resource file; default based on source filename, short -r"
-	print "  --noargv      Build applet without drag-and-drop sys.argv emulation, short -n, OSX only"
-	print "  --extra f     Extra file to put in .app bundle, short -e, OSX only"
-	print "  --verbose     Verbose, short -v"
-	print "  --help        This message, short -?"
+	print "  --output o        Output file; default based on source filename, short -o"
+	print "  --resource r      Resource file; default based on source filename, short -r"
+	print "  --noargv          Build applet without drag-and-drop sys.argv emulation, short -n, OSX only"
+	print "  --extra src[:dst] Extra file to put in .app bundle, short -e, OSX only"
+	print "  --verbose         Verbose, short -v"
+	print "  --help            This message, short -?"
 	sys.exit(1)
 
 class Verbose: