diff --git a/fiftyone.pipeline.engines/tracker.js b/fiftyone.pipeline.engines/tracker.js
index 35c37c1..ef45ed9 100644
--- a/fiftyone.pipeline.engines/tracker.js
+++ b/fiftyone.pipeline.engines/tracker.js
@@ -1,23 +1,23 @@
-/* *********************************************************************
- * This Original Work is copyright of 51 Degrees Mobile Experts Limited.
- * Copyright 2023 51 Degrees Mobile Experts Limited, Davidson House,
- * Forbury Square, Reading, Berkshire, United Kingdom RG1 3EU.
- *
- * This Original Work is licensed under the European Union Public Licence
- * (EUPL) v.1.2 and is subject to its terms as set out below.
- *
- * If a copy of the EUPL was not distributed with this file, You can obtain
- * one at https://opensource.org/licenses/EUPL-1.2.
- *
- * The 'Compatible Licences' set out in the Appendix to the EUPL (as may be
- * amended by the European Commission) shall be deemed incompatible for
- * the purposes of the Work and the provisions of the compatibility
- * clause in Article 5 of the EUPL shall not apply.
- *
- * If using the Work as, or as part of, a network application, by
- * including the attribution notice(s) required under Article 5 of the EUPL
- * in the end user terms of the application under an appropriate heading,
- * such notice(s) shall fulfill the requirements of that article.
+/* *********************************************************************
+ * This Original Work is copyright of 51 Degrees Mobile Experts Limited.
+ * Copyright 2023 51 Degrees Mobile Experts Limited, Davidson House,
+ * Forbury Square, Reading, Berkshire, United Kingdom RG1 3EU.
+ *
+ * This Original Work is licensed under the European Union Public Licence
+ * (EUPL) v.1.2 and is subject to its terms as set out below.
+ *
+ * If a copy of the EUPL was not distributed with this file, You can obtain
+ * one at https://opensource.org/licenses/EUPL-1.2.
+ *
+ * The 'Compatible Licences' set out in the Appendix to the EUPL (as may be
+ * amended by the European Commission) shall be deemed incompatible for
+ * the purposes of the Work and the provisions of the compatibility
+ * clause in Article 5 of the EUPL shall not apply.
+ *
+ * If using the Work as, or as part of, a network application, by
+ * including the attribution notice(s) required under Article 5 of the EUPL
+ * in the end user terms of the application under an appropriate heading,
+ * such notice(s) shall fulfill the requirements of that article.
  * ********************************************************************* */
 
 const DataKeyedCache = require('./dataKeyedCache');
@@ -49,7 +49,7 @@ class Tracker extends DataKeyedCache {
    * If object is found in cache, the match function is called
    *
    * @param {object} result of the track function
-   * @returns {Boolen} whether a match has been made
+   * @returns {boolean} whether a match has been made
    */
   match (result) {
     return true;
diff --git a/fiftyone.pipeline.engines/types/tracker.d.ts b/fiftyone.pipeline.engines/types/tracker.d.ts
index 168a831..3ea9654 100644
--- a/fiftyone.pipeline.engines/types/tracker.d.ts
+++ b/fiftyone.pipeline.engines/types/tracker.d.ts
@@ -17,7 +17,7 @@ declare class Tracker extends DataKeyedCache {
      * If object is found in cache, the match function is called
      *
      * @param {object} result of the track function
-     * @returns {Boolen} whether a match has been made
+     * @returns {boolean} whether a match has been made
      */
     match(result: object): any;
 }