diff --git a/src/deprecated.ts b/src/deprecated.ts
index cd7f6b6b..5bb254d8 100644
--- a/src/deprecated.ts
+++ b/src/deprecated.ts
@@ -14,9 +14,51 @@
  * limitations under the License.
  */
 
-export {onCLS as getCLS} from './onCLS.js';
-export {onFCP as getFCP} from './onFCP.js';
-export {onFID as getFID} from './onFID.js';
-export {onINP as getINP} from './onINP.js';
-export {onLCP as getLCP} from './onLCP.js';
-export {onTTFB as getTTFB} from './onTTFB.js';
+export {
+  /**
+   * @deprecated Use `onCLS()` instead.
+   */
+  onCLS as getCLS,
+} from './onCLS.js';
+
+export {
+  /**
+   * @deprecated Use `onFCP()` instead.
+   */
+  onFCP as getFCP,
+} from './onFCP.js';
+
+export {
+  /**
+   * @deprecated Use `onFID()` instead.
+   */
+  onFID as getFID,
+} from './onFID.js';
+
+export {
+  /**
+   * @deprecated Use `onINP()` instead.
+   */
+  onINP as getINP,
+} from './onINP.js';
+
+export {
+  /**
+   * @deprecated Use `onLCP()` instead.
+   */
+  onLCP as getLCP,
+} from './onLCP.js';
+
+export {
+  /**
+   * @deprecated Use `onTTFB()` instead.
+   */
+  onTTFB as getTTFB,
+} from './onTTFB.js';
+
+export {
+  /**
+   * @deprecated Use `ReportCallback` instead.
+   */
+  ReportCallback as ReportHandler,
+} from './types.js';