diff --git a/dispatcher/backend/src/common/external.py b/dispatcher/backend/src/common/external.py
index fd5de704..3706b0f0 100644
--- a/dispatcher/backend/src/common/external.py
+++ b/dispatcher/backend/src/common/external.py
@@ -29,7 +29,7 @@
 
 def update_workers_whitelist(session: so.Session):
     """update whitelist of workers on external services"""
-    ExternalIpUpdater.update_fn(build_workers_whitelist(session=session))
+    ExternalIpUpdater.update(build_workers_whitelist(session=session))
 
 
 def build_workers_whitelist(session: so.Session) -> typing.List[str]:
@@ -150,7 +150,13 @@ def get_statement():
 
 
 class ExternalIpUpdater:
-    update_fn = update_wasabi_whitelist
+    """Class responsible to push IP updates to external system(s)
+
+    `update` is called with the new list of all workers IPs everytime
+    a change is detected.
+    By default, this class update our IPs whitelist in Wasabi"""
+
+    update = update_wasabi_whitelist
 
 
 @dbsession
diff --git a/dispatcher/backend/src/tests/integration/routes/workers/test_worker.py b/dispatcher/backend/src/tests/integration/routes/workers/test_worker.py
index 3be8cf17..f20ff099 100644
--- a/dispatcher/backend/src/tests/integration/routes/workers/test_worker.py
+++ b/dispatcher/backend/src/tests/integration/routes/workers/test_worker.py
@@ -296,7 +296,7 @@ def test_requested_task_worker_update_ip_whitelist(
         # setup custom ip updater to intercept Wasabi operations
         updater = IpUpdaterAndChecker(should_fail=external_update_fails)
         assert TestWorkerRequestedTasks.new_ip_address not in updater.ip_addresses
-        ExternalIpUpdater.update_fn = updater.ip_update
+        ExternalIpUpdater.update = updater.ip_update
         constants.USES_WORKERS_IPS_WHITELIST = external_update_enabled
 
         # call it once to set next_ip