diff --git a/QtSLiM/QtSLiMAppDelegate.cpp b/QtSLiM/QtSLiMAppDelegate.cpp
index c2495553..f2350913 100644
--- a/QtSLiM/QtSLiMAppDelegate.cpp
+++ b/QtSLiM/QtSLiMAppDelegate.cpp
@@ -79,7 +79,7 @@
 #ifdef __APPLE__
 // On macOS we enforce Qt 5.15.2 as a hard limit; macOS does not have Qt preinstalled, and there is
 // not much reason for anybody to use a version prior to 5.15.2 for a build.  5.15.2 is the only
-// LTS version with support for macOS 11, dark mode, and various other things we want.  However,
+// Qt5 LTS version with support for macOS 11, dark mode, and various other things we want.  However,
 // if you need to build against an earlier Qt version (because you're using a macOS version earlier
 // than 10.13, perhaps), you can disable this check using the above flag and your build will probably
 // work; just note that that configuration is unsupported.
@@ -97,7 +97,7 @@
 
 // We now support Qt 6, but do not require it.  Note that SLiM 4.2.2 was the last version that supported only Qt 5.
 #if (QT_VERSION >= QT_VERSION_CHECK(7, 0, 0))
-#error "SLiMgui requires Qt 5.15 or Qt 6.  Qt 7 and later are not supported at this time."
+#error "SLiMgui requires Qt 5 or Qt 6.  Qt 7 and later are not supported at this time."
 #endif
 #if (QT_VERSION < QT_VERSION_CHECK(5, 0, 0))
 #error "SLiMgui requires Qt 5 or Qt 6.  Qt 4 and earlier are not supported."
diff --git a/QtSLiM/QtSLiMWindow.cpp b/QtSLiM/QtSLiMWindow.cpp
index 86d3aa87..1d8c0cee 100644
--- a/QtSLiM/QtSLiMWindow.cpp
+++ b/QtSLiM/QtSLiMWindow.cpp
@@ -5234,6 +5234,14 @@ void QtSLiMWindow::chromosomeActionRunMenu(void)
     chromosomeActionReleased();
 }
 
+#if (QT_VERSION < QT_VERSION_CHECK(6, 0, 0))
+// In some versions of Qt5, such as 5.9.5, QChar::FormFeed did not yet exist
+#define Eidos_FormFeed 0x0C
+#else
+// In Qt6, QChar::FormFeed is the preferred symbol for this
+#define Eidos_FormFeed QChar::FormFeed
+#endif
+
 void QtSLiMWindow::jumpToPopupButtonRunMenu(void)
 {
     QPlainTextEdit *scriptTE = ui->scriptTextEdit;
@@ -5281,7 +5289,7 @@ void QtSLiMWindow::jumpToPopupButtonRunMenu(void)
             
             // Exclude comments that contain newlines and similar characters
             if ((comment.indexOf(QChar::LineFeed) != -1) ||
-                    (comment.indexOf(QChar::FormFeed) != -1) ||
+                    (comment.indexOf(Eidos_FormFeed) != -1) ||
                     (comment.indexOf(QChar::CarriageReturn) != -1) ||
                     (comment.indexOf(QChar::ParagraphSeparator) != -1) ||
                     (comment.indexOf(QChar::LineSeparator) != -1))
@@ -5465,8 +5473,8 @@ void QtSLiMWindow::jumpToPopupButtonRunMenu(void)
                 // Remove everything including and after the first newline
                 if (decl.indexOf(QChar::LineFeed) != -1)
                     decl.truncate(decl.indexOf(QChar::LineFeed));
-                if (decl.indexOf(QChar::FormFeed) != -1)                       // form feed; apparently QChar::FormFeed did not exist in older Qt versions
-                    decl.truncate(decl.indexOf(QChar::FormFeed));
+                if (decl.indexOf(Eidos_FormFeed) != -1)
+                    decl.truncate(decl.indexOf(Eidos_FormFeed));
                 if (decl.indexOf(QChar::CarriageReturn) != -1)
                     decl.truncate(decl.indexOf(QChar::CarriageReturn));
                 if (decl.indexOf(QChar::ParagraphSeparator) != -1)
@@ -5648,8 +5656,8 @@ void QtSLiMWindow::setScriptBlockLabelTextFromSelection(void)
                     // Remove everything including and after the first newline
                     if (decl.indexOf(QChar::LineFeed) != -1)
                         decl.truncate(decl.indexOf(QChar::LineFeed));
-                    if (decl.indexOf(QChar::FormFeed) != -1)                       // form feed; apparently QChar::FormFeed did not exist in older Qt versions
-                        decl.truncate(decl.indexOf(QChar::FormFeed));
+                    if (decl.indexOf(Eidos_FormFeed) != -1)
+                        decl.truncate(decl.indexOf(Eidos_FormFeed));
                     if (decl.indexOf(QChar::CarriageReturn) != -1)
                         decl.truncate(decl.indexOf(QChar::CarriageReturn));
                     if (decl.indexOf(QChar::ParagraphSeparator) != -1)
diff --git a/VERSIONS b/VERSIONS
index 976b3ce9..abeb0826 100644
--- a/VERSIONS
+++ b/VERSIONS
@@ -23,6 +23,11 @@ development head (in the master branch):
 	add calcPi() and calcTajimasD() functions thanks to Nick Bailey
 	extend deviatePositions(), pointDeviated(), sampleNearbyPoint(), and sampleImprovedNearbyPoint() to allow vectorization with a different spatial kernel for each iteration
 	shift to supporting Qt6 and C++17 to build SLiMgui; Qt5 with C++11 is still supported
+		for macOS, Qt6 is now the supported plaform for macOS 11/12/13/14; Qt5 should only be used on macOS 10.15
+		for Windows, Qt6 is now the supported platform for Windows 10 (1809 or later) and Windows 11
+		for Linux, Qt6 is now the supported platform for Red Hat 8.6/8.8/9.2, openSUSE 15.5, and Ubuntu 22.04 among others
+		these recommendations are based on Qt6's recommended platforms; earlier platforms should use Qt5
+		for more details see https://doc.qt.io/qt-6/linux.html, https://doc.qt.io/qt-6/windows.html, https://doc.qt.io/qt-6/macos.html
 	
 
 version 4.2.2 (Eidos version 3.2.2):