diff --git a/macbuild/build4mac.py b/macbuild/build4mac.py
index 75cf8eee2..075a7ef44 100755
--- a/macbuild/build4mac.py
+++ b/macbuild/build4mac.py
@@ -49,7 +49,7 @@ def GenerateUsage(platform):
     usage += "<< Usage of 'build4mac.py' >>\n"
     usage += "       for building KLayout 0.27.4 or later on different Apple macOS / Mac OSX platforms.\n"
     usage += "\n"
-    usage += "$ [python] ./build4mac.py \n"
+    usage += "$ [python] ./build4mac.py\n"
     usage += "   option & argument    : descriptions (refer to 'macbuild/build4mac_env.py' for details)| default value\n"
     usage += "   --------------------------------------------------------------------------------------+---------------\n"
     usage += "   [-q|--qt <type>]     : case-insensitive type=['Qt5MacPorts', 'Qt5Brew', 'Qt5Ana3']    | %s \n" % myQt5
@@ -70,23 +70,23 @@ def GenerateUsage(platform):
     usage += "                        :   HB38: use Python 3.8 from Homebrew                           | \n"
     usage += "                        :   Ana3: use Python 3.8 from Anaconda3                          | \n"
     usage += "                        : HBAuto: use the latest Python 3.x auto-detected from Homebrew  | \n"
-    usage += "   [-n|--noqtbinding]   : don't create Qt bindings for ruby scripts                      | disabled \n"
-    usage += "   [-u|--noqtuitools]   : don't include uitools in Qt binding                            | disabled \n"
-    usage += "   [-m|--make <option>] : option passed to 'make'                                        | '--jobs=4' \n"
-    usage += "   [-d|--debug]         : enable debug mode build                                        | disabled \n"
-    usage += "   [-c|--checkcom]      : check command-line and exit without building                   | disabled \n"
-    usage += "   [-y|--deploy]        : deploy executables and dylibs including Qt's Frameworks        | disabled \n"
-    usage += "   [-Y|--DEPLOY]        : deploy executables and dylibs for those who built KLayout      | disabled \n"
+    usage += "   [-n|--noqtbinding]   : don't create Qt bindings for ruby scripts                      | disabled\n"
+    usage += "   [-u|--noqtuitools]   : don't include uitools in Qt binding                            | disabled\n"
+    usage += "   [-m|--make <option>] : option passed to 'make'                                        | '--jobs=4'\n"
+    usage += "   [-d|--debug]         : enable debug mode build                                        | disabled\n"
+    usage += "   [-c|--checkcom]      : check command-line and exit without building                   | disabled\n"
+    usage += "   [-y|--deploy]        : deploy executables and dylibs including Qt's Frameworks        | disabled\n"
+    usage += "   [-Y|--DEPLOY]        : deploy executables and dylibs for those who built KLayout      | disabled\n"
     usage += "                        : from the source code and use the tools in the same machine     | \n"
     usage += "                        : ! After confirmation of successful build of 'klayout.app',     | \n"
     usage += "                        :   rerun this script with BOTH:                                 | \n"
     usage += "                        :     1) the same options used for building AND                  | \n"
     usage += "                        :     2) <-y|--deploy> OR <-Y|--DEPLOY>                          | \n"
     usage += "                        :   optionally with [-v|--verbose <0-3>]                         | \n"
-    usage += "   [-v|--verbose <0-3>] : verbose level of `macdeployqt' (effective with -y only)        | 1 \n"
+    usage += "   [-v|--verbose <0-3>] : verbose level of `macdeployqt' (effective with -y only)        | 1\n"
     usage += "                        : 0 = no output, 1 = error/warning (default),                    | \n"
     usage += "                        : 2 = normal,    3 = debug                                       | \n"
-    usage += "   [-?|--?]             : print this usage and exit                                      | disabled \n"
+    usage += "   [-?|--?]             : print this usage and exit                                      | disabled\n"
     usage += "-----------------------------------------------------------------------------------------+---------------\n"
     return (usage, moduleset)
 
diff --git a/macbuild/makeDMG4mac.py b/macbuild/makeDMG4mac.py
index ef9a51d19..a9b3f5c0d 100755
--- a/macbuild/makeDMG4mac.py
+++ b/macbuild/makeDMG4mac.py
@@ -75,24 +75,24 @@ def SetGlobals():
     global Bit                # machine bit-size
 
     Usage  = "\n"
-    Usage += "--------------------------------------------------------------------------------------------------------\n"
+    Usage += "---------------------------------------------------------------------------------------------------------\n"
     Usage += "<< Usage of 'makeDMG4mac.py' >>\n"
-    Usage += "       for making a DMG file of KLayout 0.26.12 or later on different Apple macOS / Mac OSX platforms.\n"
+    Usage += "       for making a DMG file of KLayout 0.27.4 or later on different Apple macOS / Mac OSX platforms.\n"
     Usage += "\n"
-    Usage += "$ [python] ./makeDMG4mac.py \n"
+    Usage += "$ [python] ./makeDMG4mac.py\n"
     Usage += "   option & argument    : descriptions                                               | default value\n"
-    Usage += "   ----------------------------------------------------------------------------------+---------------\n"
-    Usage += "   <-p|--pkg <dir>>     : package directory created by `build4mac.py` with [-y|-Y]   | `` \n"
+    Usage += "   ----------------------------------------------------------------------------------+-----------------\n"
+    Usage += "   <-p|--pkg <dir>>     : package directory created by `build4mac.py` with [-y|-Y]   | ``\n"
     Usage += "                        : like 'ST-qt5MP.pkg.macos-Catalina-release-RsysPsys'        | \n"
-    Usage += "   <-c|--clean>         : clean the work directory                                   | disabled \n"
-    Usage += "   <-m|--make>          : make a compressed DMG file                                 | disabled \n"
+    Usage += "   <-c|--clean>         : clean the work directory                                   | disabled\n"
+    Usage += "   <-m|--make>          : make a compressed DMG file                                 | disabled\n"
     Usage += "                        :   <-c|--clean> and <-m|--make> are mutually exclusive      | \n"
-    Usage += "   [-b|--bundle <name>] : forcibly use this bundle name in the DMG                   | '' \n"
-    Usage += "   [-s|--serial <num>]  : DMG serial number                                          | 1 \n"
-    Usage += "   [-u|--unsafe]        : Ignores a few checks (use with caution)                    | disabled \n"
-    Usage += "   [-t|--targetdmg]     : Specify output .dmg filename                               | chosen by script \n"
-    Usage += "   [-?|--?]             : print this usage and exit                                  | disabled \n"
-    Usage += "-------------------------------------------------------------------------------------+------------------\n"
+    Usage += "   [-b|--bundle <name>] : forcibly use this bundle name in the DMG                   | ''\n"
+    Usage += "   [-s|--serial <num>]  : DMG serial number                                          | 1\n"
+    Usage += "   [-u|--unsafe]        : Ignores a few checks (use with caution)                    | disabled\n"
+    Usage += "   [-t|--targetdmg]     : Specify output .dmg filename                               | chosen by script\n"
+    Usage += "   [-?|--?]             : print this usage and exit                                  | disabled\n"
+    Usage += "-------------------------------------------------------------------------------------+-------------------\n"
 
     ProjectDir = os.getcwd()
     (System, Node, Release, Version, Machine, Processor) = platform.uname()
@@ -137,7 +137,7 @@ def SetGlobals():
         sys.exit(1)
 
     if not Machine == "x86_64":
-        if Machine == "arm64" and Platform == "BigSur": # with an Apple Silicon Chip
+        if Machine == "arm64" and (Platform == "Monterey" or Platform == "BigSur"): # with an Apple Silicon Chip
             print("")
             print( "### Your Mac equips an Apple Silicon Chip ###" )
             print("")
diff --git a/macbuild/nightlyBuild.py b/macbuild/nightlyBuild.py
index 1ccab6be3..ceaf277cb 100755
--- a/macbuild/nightlyBuild.py
+++ b/macbuild/nightlyBuild.py
@@ -188,7 +188,7 @@ def Parse_CommandLine_Arguments():
     Usage += " nightlyBuild.py [EXPERIMENTAL] \n"
     Usage += "   << To execute the jobs for making KLayout's DMGs for macOS Catalina, Big Sur, or Monterey >>\n"
     Usage += "\n"
-    Usage += "$ [python] nightlyBuild.py \n"
+    Usage += "$ [python] nightlyBuild.py\n"
     Usage += "   option & argument : comment on option if any                            | default value\n"
     Usage += "   ------------------------------------------------------------------------+--------------\n"
     Usage += "   [--target <list>] : 0='std', 1='ports', 2='brew', 3='brewHW', 4='ana3', | '%s'\n" % targetopt
@@ -305,7 +305,7 @@ def Parse_CommandLine_Arguments():
         Dropbox = opt.upload
 
     if not (Build or QATest or QACheck or MakeDMG or CleanDMG or Upload):
-        print( "! No option selected" )
+        print( "! No action selected" )
         print(Usage)
         quit()