diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 10e1633..6b25c81 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -8001,6 +8001,15 @@
                 "accessibility_display_inversion_enabled";
 
         /**
+         * Flag that specifies whether font size has been changed. The flag will
+         * be set when users change the scaled value of font size for the first time.
+         * @hide
+         */
+        @Readable
+        public static final String ACCESSIBILITY_FONT_SCALING_HAS_BEEN_CHANGED =
+                "accessibility_font_scaling_has_been_changed";
+
+        /**
          * Setting that specifies whether display color space adjustment is
          * enabled.
          *
diff --git a/core/proto/android/providers/settings/secure.proto b/core/proto/android/providers/settings/secure.proto
index 556636dd..d443270 100644
--- a/core/proto/android/providers/settings/secure.proto
+++ b/core/proto/android/providers/settings/secure.proto
@@ -89,6 +89,8 @@
         // Setting for accessibility magnification for following typing.
         optional SettingProto accessibility_magnification_follow_typing_enabled = 43 [ (android.privacy).dest = DEST_AUTOMATIC ];
         optional SettingProto contrast_level = 44 [ (android.privacy).dest = DEST_AUTOMATIC ];
+        // Settings for font scaling
+        optional SettingProto accessibility_font_scaling_has_been_changed = 51 [ (android.privacy).dest = DEST_AUTOMATIC ];
     }
     optional Accessibility accessibility = 2;
 
diff --git a/packages/SettingsProvider/src/android/provider/settings/backup/SecureSettings.java b/packages/SettingsProvider/src/android/provider/settings/backup/SecureSettings.java
index b5eaa4b..6a07dc6 100644
--- a/packages/SettingsProvider/src/android/provider/settings/backup/SecureSettings.java
+++ b/packages/SettingsProvider/src/android/provider/settings/backup/SecureSettings.java
@@ -221,6 +221,7 @@
         Settings.Secure.BLUETOOTH_LE_BROADCAST_PROGRAM_INFO,
         Settings.Secure.BLUETOOTH_LE_BROADCAST_CODE,
         Settings.Secure.BLUETOOTH_LE_BROADCAST_APP_SOURCE_NAME,
-        Settings.Secure.LOCK_SCREEN_WEATHER_ENABLED
+        Settings.Secure.LOCK_SCREEN_WEATHER_ENABLED,
+        Settings.Secure.ACCESSIBILITY_FONT_SCALING_HAS_BEEN_CHANGED
     };
 }
diff --git a/packages/SettingsProvider/src/android/provider/settings/validators/SecureSettingsValidators.java b/packages/SettingsProvider/src/android/provider/settings/validators/SecureSettingsValidators.java
index 534e31a..dd9b4845 100644
--- a/packages/SettingsProvider/src/android/provider/settings/validators/SecureSettingsValidators.java
+++ b/packages/SettingsProvider/src/android/provider/settings/validators/SecureSettingsValidators.java
@@ -355,5 +355,6 @@
         VALIDATORS.put(Secure.BLUETOOTH_LE_BROADCAST_CODE, ANY_STRING_VALIDATOR);
         VALIDATORS.put(Secure.BLUETOOTH_LE_BROADCAST_APP_SOURCE_NAME, ANY_STRING_VALIDATOR);
         VALIDATORS.put(Secure.LOCK_SCREEN_WEATHER_ENABLED, BOOLEAN_VALIDATOR);
+        VALIDATORS.put(Secure.ACCESSIBILITY_FONT_SCALING_HAS_BEEN_CHANGED, BOOLEAN_VALIDATOR);
     }
 }
diff --git a/packages/SettingsProvider/src/com/android/providers/settings/SettingsProtoDumpUtil.java b/packages/SettingsProvider/src/com/android/providers/settings/SettingsProtoDumpUtil.java
index a78faaf..c90b95a 100644
--- a/packages/SettingsProvider/src/com/android/providers/settings/SettingsProtoDumpUtil.java
+++ b/packages/SettingsProvider/src/com/android/providers/settings/SettingsProtoDumpUtil.java
@@ -1822,6 +1822,9 @@
                 Settings.Secure.ACCESSIBILITY_MAGNIFICATION_FOLLOW_TYPING_ENABLED,
                 SecureSettingsProto.Accessibility
                         .ACCESSIBILITY_MAGNIFICATION_FOLLOW_TYPING_ENABLED);
+        dumpSetting(s, p,
+                Settings.Secure.ACCESSIBILITY_FONT_SCALING_HAS_BEEN_CHANGED,
+                SecureSettingsProto.Accessibility.ACCESSIBILITY_FONT_SCALING_HAS_BEEN_CHANGED);
         p.end(accessibilityToken);
 
         final long adaptiveSleepToken = p.start(SecureSettingsProto.ADAPTIVE_SLEEP);