diff --git a/.docker/Dockerfile.cli b/.docker/Dockerfile.cli
index 88936dd..370c770 100644
--- a/.docker/Dockerfile.cli
+++ b/.docker/Dockerfile.cli
@@ -3,6 +3,7 @@ FROM govcms8lagoon/govcms8:${GOVCMS_IMAGE_VERSION}
 
 COPY themes/ /app/web/themes/custom
 COPY config /app/config
+COPY custom /app/custom
 
 # Default application favicon this will be used for files and server
 # error pages all other favicon requests will be surfaced via Drupal.
diff --git a/custom/README.md b/custom/README.md
new file mode 100644
index 0000000..f80f588
--- /dev/null
+++ b/custom/README.md
@@ -0,0 +1,3 @@
+This directory is referenced by composer.json for custom patches and extra
+packages. It contains empty configuration by default, and may be overridden
+on a case by case basis, usually for SaaS+ or PaaS sites.
diff --git a/custom/composer/composer.json b/custom/composer/composer.json
new file mode 100644
index 0000000..2c266cf
--- /dev/null
+++ b/custom/composer/composer.json
@@ -0,0 +1,5 @@
+{
+    "name": "govcms/custom",
+    "description": "Additional packages from https://satis.govcms.gov.au or where composer.json is locked.",
+    "require": {}
+}
diff --git a/custom/composer/patches.json b/custom/composer/patches.json
new file mode 100644
index 0000000..044d766
--- /dev/null
+++ b/custom/composer/patches.json
@@ -0,0 +1,4 @@
+{
+    "patches": {
+    }
+}