diff --git a/css-fonts-4/Overview.bs b/css-fonts-4/Overview.bs
index 4940fdde7f2..4d65552acfc 100644
--- a/css-fonts-4/Overview.bs
+++ b/css-fonts-4/Overview.bs
@@ -597,7 +597,7 @@ Generic font families
The precise font(s) used will depend on factors such as
platform support, platform language, locale settings,
- user settings, Unicode coverage and the content language.
+ user preferences, Unicode coverage and the content language.
UA may optionally choose to use the text rendering engine provided by the platform when using
''system-ui'' to match the appearance of the default user interface more closely.
@@ -744,6 +744,8 @@ Generic font families
Note: ''ui-serif'' is not expected to map to any font on platforms
without an appropriate system font.
+ Note: see notes on ''system-ui'' for potential issues.
+
@@ -760,6 +762,8 @@ Generic font families
Note: ''ui-sans-serif'' is not expected to map to any font on platforms
without an appropriate system font.
+ Note: see notes on ''system-ui'' for potential issues.
+
@@ -777,6 +781,8 @@ Generic font families
Note: ''ui-monospace'' is not expected to map to any font on platforms
without an appropriate system font.
+ Note: see notes on ''system-ui'' for potential issues.
+
@@ -793,6 +799,8 @@ Generic font families
Note: ''ui-rounded'' is not expected to map to any font on platforms
without an appropriate system font.
+ Note: see notes on ''system-ui'' for potential issues.
+
@@ -8158,7 +8166,10 @@ Any Installed Font which is not a User-Installed font is a Preinstalled Font. It
System Font
-The System Font is the font which is used by the ''system-ui'' generic font family name. It is an example of a Preinstalled Font.
+The System Font is the font which is used by the ''system-ui'' generic font family name. It is an example of a Preinstalled Font.
+
+Additional font styles may also be provided as ''ui-sans-serif'', ''ui-serif'', ''ui-monospace'',
+and ''ui-rounded'' which are also Preinstalled Font(s) if the system provides them.
system-ui-ar.html
@@ -760,6 +762,8 @@ Generic font families
Note: ''ui-sans-serif'' is not expected to map to any font on platforms
without an appropriate system font.
+ Note: see notes on ''system-ui'' for potential issues.
+
@@ -777,6 +781,8 @@ Generic font families
Note: ''ui-monospace'' is not expected to map to any font on platforms
without an appropriate system font.
+ Note: see notes on ''system-ui'' for potential issues.
+
@@ -793,6 +799,8 @@ Generic font families
Note: ''ui-rounded'' is not expected to map to any font on platforms
without an appropriate system font.
+ Note: see notes on ''system-ui'' for potential issues.
+
@@ -8158,7 +8166,10 @@ Any Installed Font which is not a User-Installed font is a Preinstalled Font. It