diff --git a/README.md b/README.md
index 6a56205..80eefc0 100644
--- a/README.md
+++ b/README.md
@@ -42,3 +42,7 @@ In `my_fault`, there is a filtered list.
 - [ ] Create a separate script to update the cached json file.
 - [ ] Create a cronjob to call the script that update cached json.
 - [ ] Notify user when new errors that match a criteria where found,
+
+## Reference
+
+[Airbrake - API documentation ](https://airbrake.io/docs/api/#list-projects-v4)