diff --git a/x-pack/plugins/security_solution/public/timelines/components/timeline/header/index.test.tsx b/x-pack/plugins/security_solution/public/timelines/components/timeline/header/index.test.tsx
index e0043f3b232da..e7b0ce7b7428e 100644
--- a/x-pack/plugins/security_solution/public/timelines/components/timeline/header/index.test.tsx
+++ b/x-pack/plugins/security_solution/public/timelines/components/timeline/header/index.test.tsx
@@ -177,7 +177,7 @@ describe('Header', () => {
       expect(
         wrapper.find('[data-test-subj="timelineImmutableCallOut"]').first().prop('title')
       ).toEqual(
-        'This timeline is immutable, therefore not allowed to save it within the security application, though you may continue to use the timeline to search and filter security events'
+        'This prebuilt timeline template cannot be modified. To make changes, please duplicate this template and make modifications to the duplicate template.'
       );
     });
   });
diff --git a/x-pack/plugins/security_solution/public/timelines/components/timeline/header/index.tsx b/x-pack/plugins/security_solution/public/timelines/components/timeline/header/index.tsx
index 75bfb52f2756b..e50a6ed1e45fe 100644
--- a/x-pack/plugins/security_solution/public/timelines/components/timeline/header/index.tsx
+++ b/x-pack/plugins/security_solution/public/timelines/components/timeline/header/index.tsx
@@ -73,7 +73,7 @@ const TimelineHeaderComponent: React.FC<Props> = ({
     {status === TimelineStatus.immutable && (
       <EuiCallOut
         data-test-subj="timelineImmutableCallOut"
-        title={i18n.CALL_OUT_IMMUTIABLE}
+        title={i18n.CALL_OUT_IMMUTABLE}
         color="primary"
         iconType="alert"
         size="s"
diff --git a/x-pack/plugins/security_solution/public/timelines/components/timeline/header/translations.ts b/x-pack/plugins/security_solution/public/timelines/components/timeline/header/translations.ts
index dd945d345aad8..89ad11d75cae1 100644
--- a/x-pack/plugins/security_solution/public/timelines/components/timeline/header/translations.ts
+++ b/x-pack/plugins/security_solution/public/timelines/components/timeline/header/translations.ts
@@ -14,10 +14,10 @@ export const CALL_OUT_UNAUTHORIZED_MSG = i18n.translate(
   }
 );
 
-export const CALL_OUT_IMMUTIABLE = i18n.translate(
+export const CALL_OUT_IMMUTABLE = i18n.translate(
   'xpack.securitySolution.timeline.callOut.immutable.message.description',
   {
     defaultMessage:
-      'This timeline is immutable, therefore not allowed to save it within the security application, though you may continue to use the timeline to search and filter security events',
+      'This prebuilt timeline template cannot be modified. To make changes, please duplicate this template and make modifications to the duplicate template.',
   }
 );