diff --git a/README.md b/README.md
index 62403d7..ce8efd1 100644
--- a/README.md
+++ b/README.md
@@ -75,6 +75,7 @@ The main things are required to know before deployment:
     other components
 * archived-cli could run anywhere and will require network access to
     archived-manager
+* archived-gc requires RW PostgreSQL and runs periodically as a job
 * there's no authentication on any stage at the moment (yes, even for
     cli/manager)