diff --git a/activitypub.php b/activitypub.php
index 338181e..8133880 100644
--- a/activitypub.php
+++ b/activitypub.php
@@ -3,8 +3,11 @@
 Plugin Name: ActivityPub
 */
 require_once plugin_dir_path( __FILE__ ) . 'inc/api.php';
+require_once plugin_dir_path( __FILE__ ) . 'inc/init.php';
 
-add_action( 'rest_api_init', function() {
-    \api\register_routes();
-} );
+function activitypub_init() {
+    do_action( 'activitypub_init' );
+}
+
+register_activation_hook( __FILE__, 'activitypub_init');
 ?>
diff --git a/inc/init.php b/inc/init.php
new file mode 100644
index 0000000..801265d
--- /dev/null
+++ b/inc/init.php
@@ -0,0 +1,14 @@
+<?php
+namespace init;
+
+require_once plugin_dir_path( __FILE__ ) . '/outbox.php';
+require_once plugin_dir_path( __FILE__ ) . '/api.php';
+
+add_action( 'rest_api_init', function() {
+    \api\register_routes();
+} );
+
+add_action( 'activitypub_init', function() {
+    \outbox\create_outbox_table();
+} );
+?>
diff --git a/inc/outbox.php b/inc/outbox.php
index 7058206..a9e93c6 100644
--- a/inc/outbox.php
+++ b/inc/outbox.php
@@ -10,4 +10,18 @@ When an Activity is received (i.e. POSTed) to an Actor's outbox, the server must
        target inbox.
   3. Perform side effects as necessary
 */
+namespace outbox;
+
+function create_outbox_table() {
+    global $wpdb;
+    $wpdb->Query(
+        "
+        CREATE TABLE IF NOT EXISTS activitypub_outbox (
+            id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
+            actor VARCHAR(128) NOT NULL,
+            activity TEXT NOT NULL
+        );
+        "
+    );
+}
 ?>