diff --git a/.envrc.sample b/.envrc.sample
index 3785e25..83df045 100644
--- a/.envrc.sample
+++ b/.envrc.sample
@@ -1,6 +1,25 @@
 export DOMAIN=wordpress.example.com
+
 export STACK_NAME=wordpress
 export LETS_ENCRYPT_ENV=production
 
 export DB_ROOT_PASSWORD_VERSION=v1
 export DB_PASSWORD_VERSION=v1
+
+# Multisite
+#export WORDPRESS_CONFIG_EXTRA="\
+#	define('WP_CACHE', false);\
+#	define('WP_ALLOW_MULTISITE', true );"
+
+# Multisite phase 2 (see README)
+#export WORDPRESS_CONFIG_EXTRA="\
+#	define('WP_CACHE', false);\
+#	define('WP_ALLOW_MULTISITE', true );\
+#	define('MULTISITE', true);\
+#	define('SUBDOMAIN_INSTALL', true);\
+#	define('DOMAIN_CURRENT_SITE', '${DOMAIN}');\
+#	define('PATH_CURRENT_SITE', '/');\
+#	define('SITE_ID_CURRENT_SITE', 1);\
+#	define('BLOG_ID_CURRENT_SITE', 1);\
+#	define('FORCE_SSL_ADMIN', true );\
+#	define('COOKIE_DOMAIN', \$_SERVER['HTTP_HOST']);"
diff --git a/README.md b/README.md
index 635bb3b..1c52536 100644
--- a/README.md
+++ b/README.md
@@ -19,5 +19,21 @@ Coöp Cloud + [Wordpress](https://wordpress.org) = 🥳
 9. `abra run wordpress chown www-data:www-data /var/www/html/wp-content` to fix
    file permissions (see #3)
 
+## Network (Multi-site)
+
+_(Only tested using subdomains)_
+
+1. Set up as above
+2. Uncomment the first `# Multisite` section in `.envrc`
+3. `direnv allow` (or re-run `source .envrc`)
+4. `abra deploy`
+5. Log into the Wordpress admin dashboard, go to Tools » Network Setup
+6. Don't worry about the suggested file changes
+7. Comment out the first `# Multisite` section in `.envrc` and uncomment the
+   `# Multisite phase 2` section
+8. `direnv allow` (or re-run `source .envrc`)
+9. `abra deploy`
+10. FIXME setting up SSL / routing
+
 [abra]: https://git.autonomic.zone/autonomic-cooperative/abra
 [compose-traefik]: https://git.autonomic.zone/compose-stacks/traefik
diff --git a/compose.yml b/compose.yml
index 26a8c2b..ae0ef39 100644
--- a/compose.yml
+++ b/compose.yml
@@ -14,6 +14,7 @@ services:
       - WORDPRESS_DB_USER=wordpress
       - WORDPRESS_DB_PASSWORD_FILE=/run/secrets/db_password
       - WORDPRESS_DB_NAME=wordpress
+      - WORDPRESS_CONFIG_EXTRA=${WORDPRESS_CONFIG_EXTRA}
     secrets:
       - db_password
     deploy: