diff --git a/src/annotator/guest.ts b/src/annotator/guest.ts
index 7b6eff876c5..f11fde3590a 100644
--- a/src/annotator/guest.ts
+++ b/src/annotator/guest.ts
@@ -643,6 +643,13 @@ export class Guest
 
     this._sidebarRPC.on('deleteAnnotation', (tag: string) => this.detach(tag));
 
+    // Expose document info to the sidebar on demand, so that annotation
+    // creation can be triggered from there (e.g. via the experimental new note
+    // button)
+    this._sidebarRPC.on('getDocumentInfo', async callback =>
+      callback(await this.getDocumentInfo()),
+    );
+
     this._sidebarRPC.on(
       'loadAnnotations',
       async (annotations: AnnotationData[]) => {
diff --git a/src/annotator/test/guest-test.js b/src/annotator/test/guest-test.js
index 22502fdce73..09f09b419a4 100644
--- a/src/annotator/test/guest-test.js
+++ b/src/annotator/test/guest-test.js
@@ -1,4 +1,5 @@
-import { delay } from '@hypothesis/frontend-testing';
+import { delay, waitFor } from '@hypothesis/frontend-testing';
+import sinon from 'sinon';
 
 import { EventEmitter } from '../../shared/event-emitter';
 import { DrawError } from '../draw-tool';
@@ -736,6 +737,30 @@ describe('Guest', () => {
       });
     });
 
+    describe('on "getDocumentInfo" event', () => {
+      it('gets guest document info', async () => {
+        const callback = sinon.stub();
+
+        createGuest();
+        emitSidebarEvent('getDocumentInfo', callback);
+
+        await waitFor(() => callback.called);
+
+        assert.calledWith(
+          callback,
+          sinon.match({
+            uri: 'https://example.com/test.pdf',
+            metadata: {
+              title: 'Test title',
+              documentFingerprint: 'test-fingerprint',
+            },
+          }),
+        );
+        assert.called(fakeIntegration.uri);
+        assert.called(fakeIntegration.getMetadata);
+      });
+    });
+
     describe('on "featureFlagsUpdated" event', () => {
       it('updates active feature flags', () => {
         const flagsUpdated = sinon.stub();
diff --git a/src/sidebar/components/SidebarTabs.tsx b/src/sidebar/components/SidebarTabs.tsx
index 2283c466c3d..8423b7eac6a 100644
--- a/src/sidebar/components/SidebarTabs.tsx
+++ b/src/sidebar/components/SidebarTabs.tsx
@@ -8,6 +8,7 @@ import {
 } from '@hypothesis/frontend-shared';
 import classnames from 'classnames';
 import type { ComponentChildren } from 'preact';
+import { useCallback } from 'preact/hooks';
 
 import { pluralize } from '../../shared/pluralize';
 import type { SidebarSettings } from '../../types/config';
@@ -15,6 +16,7 @@ import type { TabName } from '../../types/sidebar';
 import { applyTheme } from '../helpers/theme';
 import { withServices } from '../service-context';
 import type { AnnotationsService } from '../services/annotations';
+import type { FrameSyncService } from '../services/frame-sync';
 import { useSidebarStore } from '../store';
 import ThreadList from './ThreadList';
 import { useRootThread } from './hooks/use-root-thread';
@@ -99,6 +101,7 @@ export type SidebarTabsProps = {
   // injected
   settings: SidebarSettings;
   annotationsService: AnnotationsService;
+  frameSync: FrameSyncService;
 };
 
 /**
@@ -108,6 +111,7 @@ function SidebarTabs({
   annotationsService,
   isLoading,
   settings,
+  frameSync,
 }: SidebarTabsProps) {
   const { rootThread, tabCounts } = useRootThread();
   const store = useSidebarStore();
@@ -143,6 +147,11 @@ function SidebarTabs({
   }
   const tabCountsSummary = tabCountsSummaryPieces.join(', ');
 
+  const createPageNoteWithDocumentMeta = useCallback(async () => {
+    const { metadata } = await frameSync.getDocumentInfo();
+    annotationsService.createPageNote(metadata);
+  }, [annotationsService, frameSync]);
+
   return (
     <>
       <div aria-live="polite" role="status" className="sr-only">
@@ -201,7 +210,7 @@ function SidebarTabs({
               <div className="flex justify-end">
                 <Button
                   data-testid="new-note-button"
-                  onClick={() => annotationsService.createPageNote()}
+                  onClick={createPageNoteWithDocumentMeta}
                   variant="primary"
                   style={applyTheme(['ctaBackgroundColor'], settings)}
                 >
@@ -244,4 +253,8 @@ function SidebarTabs({
   );
 }
 
-export default withServices(SidebarTabs, ['annotationsService', 'settings']);
+export default withServices(SidebarTabs, [
+  'annotationsService',
+  'frameSync',
+  'settings',
+]);
diff --git a/src/sidebar/components/test/SidebarTabs-test.js b/src/sidebar/components/test/SidebarTabs-test.js
index 82655f7e46d..d66771bdaca 100644
--- a/src/sidebar/components/test/SidebarTabs-test.js
+++ b/src/sidebar/components/test/SidebarTabs-test.js
@@ -11,6 +11,7 @@ describe('SidebarTabs', () => {
   // mock services
   let fakeAnnotationsService;
   let fakeSettings;
+  let fakeFrameSync;
   let fakeStore;
   let fakeUseRootThread;
 
@@ -19,6 +20,7 @@ describe('SidebarTabs', () => {
       <SidebarTabs
         annotationsService={fakeAnnotationsService}
         settings={fakeSettings}
+        frameSync={fakeFrameSync}
         isLoading={false}
         {...props}
       />,
@@ -46,6 +48,9 @@ describe('SidebarTabs', () => {
     fakeSettings = {
       enableExperimentalNewNoteButton: false,
     };
+    fakeFrameSync = {
+      getDocumentInfo: sinon.stub().resolves({ metadata: {} }),
+    };
     fakeStore = {
       selectTab: sinon.stub(),
       isWaitingToAnchorAnnotations: sinon.stub().returns(false),
@@ -151,13 +156,17 @@ describe('SidebarTabs', () => {
         assert.deepEqual(button.prop('style'), { backgroundColor: '#00f' });
       });
 
-      it('should add a new page note on click', () => {
+      it('should add a new page note on click', async () => {
         fakeSettings.enableExperimentalNewNoteButton = true;
         fakeStore.selectedTab.returns('note');
 
         const wrapper = createComponent();
-        wrapper.find('Button[data-testid="new-note-button"]').props().onClick();
+        await wrapper
+          .find('Button[data-testid="new-note-button"]')
+          .props()
+          .onClick();
 
+        assert.calledOnce(fakeFrameSync.getDocumentInfo);
         assert.calledOnce(fakeAnnotationsService.createPageNote);
       });
     });
diff --git a/src/sidebar/services/annotations.ts b/src/sidebar/services/annotations.ts
index 615901c96cf..bc080522a07 100644
--- a/src/sidebar/services/annotations.ts
+++ b/src/sidebar/services/annotations.ts
@@ -1,7 +1,7 @@
 import type { ModerationStatus } from '@hypothesis/annotation-ui';
 
 import { generateHexString } from '../../shared/random';
-import type { AnnotationData } from '../../types/annotator';
+import type { AnnotationData, DocumentMetadata } from '../../types/annotator';
 import type {
   APIAnnotationData,
   Annotation,
@@ -211,7 +211,7 @@ export class AnnotationsService {
    * Create a new empty "page note" annotation and add it to the store. If the
    * user is not logged in, open the `loginPrompt` panel instead.
    */
-  createPageNote() {
+  createPageNote(document?: DocumentMetadata) {
     const topLevelFrame = this._store.mainFrame();
     if (!this._store.isLoggedIn()) {
       this._store.openSidebarPanel('loginPrompt');
@@ -227,7 +227,8 @@ export class AnnotationsService {
         },
       ],
       uri: topLevelFrame.uri,
-    };
+      document,
+    } satisfies Partial<AnnotationData>;
     this.create(pageNoteAnnotation);
   }
 
diff --git a/src/sidebar/services/frame-sync.ts b/src/sidebar/services/frame-sync.ts
index a27c4014ec2..9f795509cac 100644
--- a/src/sidebar/services/frame-sync.ts
+++ b/src/sidebar/services/frame-sync.ts
@@ -11,6 +11,7 @@ import {
   isMessageEqual,
 } from '../../shared/messaging';
 import type { Message } from '../../shared/messaging';
+import { promiseWithResolvers } from '../../shared/promise-with-resolvers';
 import type {
   AnnotationData,
   DocumentInfo,
@@ -704,6 +705,20 @@ export class FrameSyncService {
     });
   }
 
+  async getDocumentInfo(): Promise<DocumentInfo> {
+    // Get the guest for the main frame. This assumes that the annotation is
+    // anchored in the main frame.
+    const guest = this._guestRPC.get(null);
+    if (!guest) {
+      throw new Error('No guest connected');
+    }
+
+    const { promise, resolve } = promiseWithResolvers<DocumentInfo>();
+    guest.call('getDocumentInfo', resolve);
+
+    return promise;
+  }
+
   // Only used to cleanup tests
   destroy() {
     this._portFinder.destroy();
diff --git a/src/sidebar/services/test/annotations-test.js b/src/sidebar/services/test/annotations-test.js
index 310a240951b..a0a7664f9c4 100644
--- a/src/sidebar/services/test/annotations-test.js
+++ b/src/sidebar/services/test/annotations-test.js
@@ -314,18 +314,22 @@ describe('AnnotationsService', () => {
       assert.isNull(getLastAddedAnnotation());
     });
 
-    it('should create a new unsaved annotation with page note defaults', () => {
-      svc.createPageNote();
+    it.each([undefined, { title: 'foo' }])(
+      'should create a new unsaved annotation with page note defaults',
+      document => {
+        svc.createPageNote(document);
 
-      const annotation = getLastAddedAnnotation();
+        const annotation = getLastAddedAnnotation();
 
-      assert.equal(annotation.uri, 'http://www.example.com');
-      assert.deepEqual(annotation.target, [
-        {
-          source: 'http://www.example.com',
-        },
-      ]);
-    });
+        assert.equal(annotation.uri, 'http://www.example.com');
+        assert.deepEqual(annotation.target, [
+          {
+            source: 'http://www.example.com',
+          },
+        ]);
+        assert.deepEqual(annotation.document, document);
+      },
+    );
   });
 
   describe('delete', () => {
diff --git a/src/sidebar/services/test/frame-sync-test.js b/src/sidebar/services/test/frame-sync-test.js
index 0af5e505c39..27d6d52d2e8 100644
--- a/src/sidebar/services/test/frame-sync-test.js
+++ b/src/sidebar/services/test/frame-sync-test.js
@@ -1,4 +1,5 @@
 import { delay } from '@hypothesis/frontend-testing';
+import sinon from 'sinon';
 
 import { EventEmitter } from '../../../shared/event-emitter';
 import { Injector } from '../../../shared/injector';
@@ -1279,4 +1280,36 @@ describe('FrameSyncService', () => {
       assert.equal(err.message, 'Something went wrong');
     });
   });
+
+  describe('#getDocumentInfo', () => {
+    beforeEach(async () => {
+      await frameSync.connect();
+    });
+
+    it('rejects if guest is not connected', async () => {
+      let err;
+      try {
+        await frameSync.getDocumentInfo();
+      } catch (e) {
+        err = e;
+      }
+      assert.instanceOf(err, Error);
+      assert.equal(err.message, 'No guest connected');
+    });
+
+    it('requests document info from guest', async () => {
+      await connectGuest();
+
+      guestRPC().call.callsFake((method, callback) => {
+        if (method === 'getDocumentInfo') {
+          delay(0).then(() => callback({ title: 'foo' }));
+        }
+      });
+
+      const document = await frameSync.getDocumentInfo();
+
+      assert.calledWith(guestRPC().call, 'getDocumentInfo', sinon.match.func);
+      assert.deepEqual(document, { title: 'foo' });
+    });
+  });
 });
diff --git a/src/types/port-rpc-calls.d.ts b/src/types/port-rpc-calls.d.ts
index c297f2c5535..c95abef3128 100644
--- a/src/types/port-rpc-calls.d.ts
+++ b/src/types/port-rpc-calls.d.ts
@@ -202,6 +202,11 @@ export type SidebarToGuestCalls = {
    * current activity / assignment.
    */
   setOutsideAssignmentNoticeVisible(visible: boolean): void;
+
+  /**
+   * Expose the guest document info to the sidebar
+   */
+  getDocumentInfo(callback: (info: DocumentInfo) => void): void;
 };
 
 /** Calls that the sidebar makes to the host. */