diff --git a/response/slack/incident_commands.py b/response/slack/incident_commands.py
index 75f8b01b..d38fbe99 100644
--- a/response/slack/incident_commands.py
+++ b/response/slack/incident_commands.py
@@ -6,6 +6,7 @@
 from response.slack.client import SlackError, reference_to_id
 from datetime import datetime
 
+
 @incident_command(['help'], helptext='Display a list of commands and usage')
 def send_help_text(incident: Incident, user_id: str, message: str):
     return True, get_help()
diff --git a/response/slack/signals.py b/response/slack/signals.py
index 403df2bc..3165e996 100644
--- a/response/slack/signals.py
+++ b/response/slack/signals.py
@@ -1,12 +1,13 @@
-from django.db.models.signals import post_save
-from django.core.signals import request_finished
+from urllib.parse import urljoin
+
+from django.db.models.signals import pre_save, post_save
 from django.dispatch import receiver
+from django.conf import settings
+from django.urls import reverse
 
 from response.core.models import Incident
 from response.slack.models import HeadlinePost
 
-from time import sleep
-
 
 @receiver(post_save, sender=Incident)
 def update_headline_after_incident_save(sender, instance, **kwargs):
@@ -28,6 +29,28 @@ def update_headline_after_incident_save(sender, instance, **kwargs):
         )
 
 
+@receiver(pre_save, sender=Incident)
+def prompt_incident_report(sender, instance: Incident, **kwargs):
+    """
+    Prompt incident lead to complete a report when an incident is closed.
+    """
+
+    try:
+        prev_state = Incident.objects.get(pk=instance.pk)
+    except Incident.DoesNotExist:
+        # Incident hasn't been saved yet, nothing to do here.
+        return
+
+    if instance.is_closed() and not prev_state.is_closed():
+        user_to_notify = instance.lead or instance.reporter
+        doc_url = urljoin(
+            settings.SITE_URL,
+            reverse('incident_doc', kwargs={'incident_id': instance.pk})
+        )
+        settings.SLACK_CLIENT.send_message(
+            user_to_notify.external_id, f"👋 Don't forget to fill out an incident report here: {doc_url}")
+
+
 @receiver(post_save, sender=HeadlinePost)
 def update_headline_after_save(sender, instance, **kwargs):
     """
diff --git a/response/slack/slack_utils.py b/response/slack/slack_utils.py
deleted file mode 100644
index e69de29b..00000000
diff --git a/tests/conftest.py b/tests/conftest.py
index c0003d32..c4989c97 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -8,10 +8,10 @@
 import pytest
 from unittest.mock import MagicMock
 
-from response.slack import dialog_builder, slack_utils, block_kit
 from response.slack.authentication import generate_signature
 from response.slack.client import SlackClient
 
+
 @pytest.fixture(autouse=True)
 def mock_slack(monkeypatch):
     mock_slack = MagicMock(spec=SlackClient(""))