diff --git a/src/olympia/scanners/admin.py b/src/olympia/scanners/admin.py
index d54aa0dc0828..40617dd58463 100644
--- a/src/olympia/scanners/admin.py
+++ b/src/olympia/scanners/admin.py
@@ -56,6 +56,9 @@
 from .tasks import run_scanner_query_rule
 
 
+SERVICE_ACCOUNT_SHEET_URL = 'https://docs.google.com/spreadsheets/d/1VdiUAoluolqZIwvMZebaJIMqPbdewwiD-S8Z2g7gx08'
+
+
 @admin.display(description='Matched Rules')
 def formatted_matched_rules_with_files_and_data(
     obj,
@@ -1118,3 +1121,12 @@ def save_model(self, request, obj, form, change):
                 )
             except Exception:  # noqa: S110 (best-effort display of one-time JWT keys)
                 pass
+            messages.add_message(
+                request,
+                messages.INFO,
+                format_html(
+                    'You must add this new webhook account to the '
+                    '<a href="{}">service account sheet</a>.',
+                    SERVICE_ACCOUNT_SHEET_URL,
+                ),
+            )
diff --git a/src/olympia/scanners/tests/test_admin.py b/src/olympia/scanners/tests/test_admin.py
index 720dc3080b57..78a5f4748b8c 100644
--- a/src/olympia/scanners/tests/test_admin.py
+++ b/src/olympia/scanners/tests/test_admin.py
@@ -2341,6 +2341,7 @@ def test_create(self):
         assert b'Please note the JWT keys' in response.content
         assert api_key.key.encode() in response.content
         assert api_key.secret.encode() in response.content
+        assert b'service account sheet' in response.content
 
         response = self.client.post(
             reverse('admin:scanners_scannerwebhook_change', args=(webhook.pk,)),