diff --git a/portmgr/dmg/Distribution b/portmgr/dmg/Distribution
index 9c7b84629..66a3bbd37 100644
--- a/portmgr/dmg/Distribution
+++ b/portmgr/dmg/Distribution
@@ -8,7 +8,7 @@
 function InstallationCheck () {
     if (system.compareVersions(system.version.ProductVersion, "__XVERS__") < 0
         || system.compareVersions(system.version.ProductVersion, "__NEXT_XVERS__") >= 0) {
-        my.result.message = "This package is meant to be installed on Mac OS X __XVERS__.";
+        my.result.message = "This package is meant to be installed on macOS __XVERS__.";
         my.result.type = 'Fatal';
         return false;
     }
diff --git a/portmgr/dmg/ReadMe.rtf b/portmgr/dmg/ReadMe.rtf
index f844c0a68..cb37f2c0f 100644
--- a/portmgr/dmg/ReadMe.rtf
+++ b/portmgr/dmg/ReadMe.rtf
@@ -18,7 +18,7 @@ MacPorts provides an infrastructure for building, installing, and packaging open
 System Requirements:
 \f0\b0 \
 \
-This installer is built for Mac OS X __XVERS__.x and requires valid curl and OpenSSL installations to function - all present by default on Mac OS X. Also required is the installation of Apple's Xcode development suite, available from the Mac App Store or from {\field{\*\fldinst{HYPERLINK "https://developer.apple.com/xcode/"}}{\fldrslt Apple's Developer site}}. It is also available as a separate installation on Mac OS X CDs and DVDs.\
+This installer is built for macOS __XVERS__.x and requires valid curl and OpenSSL installations to function - all present by default on macOS. Also required is the installation of Apple's Xcode development suite, available from the Mac App Store or from {\field{\*\fldinst{HYPERLINK "https://developer.apple.com/xcode/"}}{\fldrslt Apple's Developer site}}. It is also available as a separate installation on Mac OS X CDs and DVDs.\
 \
 \