diff --git a/.env.sample b/.env.sample
index dc96b53..c1925fd 100644
--- a/.env.sample
+++ b/.env.sample
@@ -11,6 +11,9 @@ LETS_ENCRYPT_ENV=production
 SECRET_DB_ROOT_PASSWORD_VERSION=v1
 SECRET_DB_PASSWORD_VERSION=v1
 
+# Mostly for compatibility with existing database dumps...
+#WORDPRESS_TABLE_PREFIX=wp_
+
 # Multisite
 #WORDPRESS_CONFIG_EXTRA="\
 #	define('WP_CACHE', false);\
diff --git a/compose.yml b/compose.yml
index 509fa17..ac250af 100644
--- a/compose.yml
+++ b/compose.yml
@@ -16,6 +16,7 @@ services:
       - WORDPRESS_DB_PASSWORD_FILE=/run/secrets/db_password
       - WORDPRESS_DB_NAME=wordpress
       - WORDPRESS_CONFIG_EXTRA=${WORDPRESS_CONFIG_EXTRA}
+      - WORDPRESS_TABLE_PREFIX
       - PHP_EXTENSIONS
     secrets:
       - db_password