diff --git a/src/api.js b/src/api.ts
similarity index 88%
rename from src/api.js
rename to src/api.ts
index c9f21edd0f113..bedc18e470a81 100644
--- a/src/api.js
+++ b/src/api.ts
@@ -14,6 +14,10 @@
  * limitations under the License.
  */
 
+/* This file is used in two places:
+ * 1) the coverage-utils use it to gain a list of all methods we check for test coverage on
+ * 2) index.js uses it to iterate through all methods and call helper.installAsyncStackHooks on
+ */
 module.exports = {
   Accessibility: require('./Accessibility').Accessibility,
   Browser: require('./Browser').Browser,