diff --git a/src/profile_dialog.cpp b/src/profile_dialog.cpp
index 3dbf0ac..eeb8744 100644
--- a/src/profile_dialog.cpp
+++ b/src/profile_dialog.cpp
@@ -318,8 +318,10 @@ void ProfileDialog::refreshAuthFields()
             QStringLiteral("RDP: username and password are required. Domain is optional."));
     } else if (isVnc) {
         m_usernameInput->setPlaceholderText(QStringLiteral("optional"));
-        m_protocolHint->setText(
-            QStringLiteral("VNC: host and port are required. Username/domain are optional and ignored by most servers."));
+        m_protocolHint->setText(QStringLiteral(
+            "VNC: host and port are required. Username is optional and ignored by most "
+            "servers, except macOS's built-in Screen Sharing, which requires it. Domain is "
+            "unused."));
     }
 
     m_folderHint->setText(m_defaultFolderPath.isEmpty()