diff --git a/services/web/migrations/20230512100122_ensure_history_migration.js b/services/web/migrations/20230512100122_ensure_history_migration.js
index fda5e67950..0a2778da51 100644
--- a/services/web/migrations/20230512100122_ensure_history_migration.js
+++ b/services/web/migrations/20230512100122_ensure_history_migration.js
@@ -1,3 +1,6 @@
+const { promisify } = require('util')
+const sleep = promisify(setTimeout)
+
 exports.tags = ['server-ce', 'server-pro']
 
 exports.migrate = async client => {
@@ -6,6 +9,39 @@ exports.migrate = async client => {
     'overleaf.history.display': { $ne: true },
   })
   if (count > 0) {
+    console.error(`
+-----------------------------------------------------------------------
+
+  Full Project History migration not completed for ${count} projects.
+
+  Starting with Server Pro/Community Edition version 4.0,
+  all projects must use the full project history feature.
+
+  Release 3.5 includes a migration process. Please go back to version
+   3.5 and run through the migration process:
+
+    Overleaf Toolkit setups:
+
+      toolkit$ echo "3.5.13" > config/version
+      toolkit$ bin/up
+
+    Legacy docker compose setups/Horizontal scaling setups:
+
+      Update the image tag for "services -> sharelatex" to
+        Server Pro:        quay.io/sharelatex/sharelatex-pro:3.5.13.
+        Community Edition: sharelatex/sharelatex:3.5.13
+      Then use "docker compose up" to apply the changes.
+
+  Documentation for the migration process:
+    https://github.com/overleaf/overleaf/wiki/Full-Project-History-Migration
+
+
+  Refusing to start up, exiting in 10s.
+
+-----------------------------------------------------------------------
+`)
+    await sleep(10_000)
+
     throw new Error(
       `Found ${count} projects not migrated to Full Project History`
     )