diff --git a/res/values/strings.xml b/res/values/strings.xml
index 5878115835a..73014110967 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -4959,6 +4959,8 @@
     <string name="accessibility_daltonizer_master_switch_title">Use color correction</string>
     <!-- Used in the Captions settings screen to control turning on/off the feature entirely -->
     <string name="accessibility_caption_master_switch_title">Use captions</string>
+    <!-- Used in the Captions preference to tell users that the setting doesn't support all apps. [CHAR LIMIT=NONE] -->
+    <string name="accessibility_caption_preference_summary">Not all apps support this setting.</string>
 
     <!-- Button text for the accessibility dialog continue to the next screen for hearing aid. [CHAR LIMIT=32] -->
     <string name="accessibility_hearingaid_instruction_continue_button">Continue</string>
diff --git a/res/xml/captioning_settings.xml b/res/xml/captioning_settings.xml
index 56e0e2d3d76..766d88f80d3 100644
--- a/res/xml/captioning_settings.xml
+++ b/res/xml/captioning_settings.xml
@@ -88,4 +88,8 @@
             android:title="@string/captioning_window_opacity" />
     </PreferenceCategory>
 
+    <com.android.settingslib.widget.FooterPreference
+        android:title="@string/accessibility_caption_preference_summary"
+        android:selectable="false" />
+
 </PreferenceScreen>