diff --git a/README b/README
index 6f9a56c809..c56e031c5a 100644
--- a/README
+++ b/README
@@ -162,6 +162,7 @@ REQUIREMENTS:
 
         Required for systemd-oomd:
           CONFIG_PSI
+          CONFIG_MEMCG
 
         Note that kernel auditing is broken when used with systemd's container
         code. When using systemd in conjunction with containers, please make