diff --git a/CHANGELOG.md b/CHANGELOG.md
index 54b4b3849..a1cd547d9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 ### IMPORTANT NOTES
 
+ * **Important** SQL migrations (in particular `0685-multiple-actor-images`) can take several minutes to complete
  * **Important** You need to execute manually a migration script (can be executed after your upgrade, while your PeerTube instance is running) to generate smaller avatar miniatures:
    * Classic installation: `cd /var/www/peertube/peertube-latest && sudo -u peertube NODE_CONFIG_DIR=/var/www/peertube/config NODE_ENV=production node dist/scripts/migrations/peertube-4.2.js`
    * Docker installation: `cd /var/www/peertube-docker && docker-compose exec -u peertube peertube node dist/scripts/migrations/peertube-4.2.js`