diff --git a/docker-compose.pgsql-tuning.yml b/docker-compose.pgsql-tuning.yml
index ac284c024..7ac8c5ecd 100644
--- a/docker-compose.pgsql-tuning.yml
+++ b/docker-compose.pgsql-tuning.yml
@@ -1,5 +1,8 @@
 services:
   db:
+    # If you use a config generator, use the value below for your
+    # "ram" size
+    shm_size: 4gb
     command:
       - "postgres"
       - "-c"