diff --git a/README.md b/README.md
index 02227f7..e3a1293 100644
--- a/README.md
+++ b/README.md
@@ -68,6 +68,12 @@ You can make users **moderators**. They will then be able to **delete any post**
 
 **--admin** option will **make the user moderator** and **--no-admin** will **take away the moderator privileges** from the user.
 
+### Database prune
+
+To avoid bigger backups than necessary, you can prune from the database objects which are more than 90 days old:
+
+    $ ( cd /var/www/pleroma/live && sudo -u pleroma MIX_ENV=prod ./bin/pleroma_ctl database prune_objects )
+
 ## Documentation and resources
 
 * Official app website: <https://pleroma.social/>