diff --git a/modules/cloud-config-container/squid/README.md b/modules/cloud-config-container/squid/README.md
index 4ee29ed91..eceff67d3 100644
--- a/modules/cloud-config-container/squid/README.md
+++ b/modules/cloud-config-container/squid/README.md
@@ -43,9 +43,11 @@ module "vm" {
     google-logging-enabled = true
   }
   boot_disk = {
-    image = "projects/cos-cloud/global/images/family/cos-stable"
-    type  = "pd-ssd"
-    size  = 10
+    initialize_params = {
+      image = "projects/cos-cloud/global/images/family/cos-stable"
+      type  = "pd-ssd"
+      size  = 10
+    }
   }
   tags = ["http-server", "ssh"]
 }