diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 43fccbeb5251d..8e7dc26158d52 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -8000,6 +8000,15 @@ public final class Settings {
         public static final String ACCESSIBILITY_DISPLAY_INVERSION_ENABLED =
                 "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 556636ddd2106..d443270575d3b 100644
--- a/core/proto/android/providers/settings/secure.proto
+++ b/core/proto/android/providers/settings/secure.proto
@@ -89,6 +89,8 @@ message SecureSettingsProto {
         // 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 b5eaa4b776b8b..6a07dc6603ca1 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 @@ public class SecureSettings {
         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 534e31ae42ee7..dd9b48457333e 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 @@ public class SecureSettingsValidators {
         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 17078c4c81f26..1d66d3e151e02 100644
--- a/packages/SettingsProvider/src/com/android/providers/settings/SettingsProtoDumpUtil.java
+++ b/packages/SettingsProvider/src/com/android/providers/settings/SettingsProtoDumpUtil.java
@@ -1828,6 +1828,9 @@ class SettingsProtoDumpUtil {
                 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);