diff --git a/inc/cli/class-migrate-command.php b/inc/cli/class-migrate-command.php
index c8d5893..017303b 100644
--- a/inc/cli/class-migrate-command.php
+++ b/inc/cli/class-migrate-command.php
@@ -49,6 +49,12 @@ class Migrate_Command extends WP_CLI_Command {
 	 *   - false
 	 * ---
 	 *
+	 * [--post-type=<post-type>]
+	 * : Post type, or comma separated list of post types.
+	 * ---
+	 * default: post
+	 * ---
+	 *
 	 * ## EXAMPLES
 	 *
 	 *     wp authorship migrate wp-authors --dry-run=true
@@ -79,6 +85,9 @@ public function wp_authors( $args, $assoc_args ) : void {
 			WP_CLI::warning( 'Overwriting of previous Authorship data is set to true.' );
 		}
 
+		$post_types = explode( ',', $assoc_args['post-type'] );
+		WP_CLI::line( sprintf( 'Updating post types: %s', implode( ', ', $post_types ) ) );
+
 		$tax_query = $overwrite ? [] : [
 			[
 				'taxonomy' => 'authorship',
@@ -93,6 +102,7 @@ public function wp_authors( $args, $assoc_args ) : void {
 			$posts = get_posts( [
 				'posts_per_page'      => $posts_per_page,
 				'paged'               => $paged,
+				'post_type'           => $post_types,
 				'post_status'         => 'any',
 				'ignore_sticky_posts' => true,
 				'suppress_filters'    => false,
diff --git a/tests/phpunit/test-cli.php b/tests/phpunit/test-cli.php
new file mode 100644
index 0000000..42f7392
--- /dev/null
+++ b/tests/phpunit/test-cli.php
@@ -0,0 +1,78 @@
+<?php
+/**
+ * Plugin CLI command tests.
+ *
+ * @package authorship
+ */
+
+declare( strict_types=1 );
+
+namespace Authorship\Tests;
+
+use Authorship\CLI;
+use const Authorship\POSTS_PARAM;
+use const Authorship\TAXONOMY;
+
+class TestCLI extends TestCase {
+	public function set_up() {
+		parent::set_up();
+		require_once dirname( __DIR__, 2 ) . '/inc/cli/namespace.php';
+		require_once dirname( __DIR__, 2 ) . '/inc/cli/class-migrate-command.php';
+		CLI\bootstrap();
+	}
+
+	public function testMigratePostTypePost() : void {
+		$factory = self::factory()->post;
+
+		// Post. Owned by editor, attributed to nobody.
+		$post1 = $factory->create_and_get( [
+			'post_author' => self::$users['editor']->ID,
+		] );
+
+		// Unset author data.
+		wp_set_post_terms( $post1->ID, [], TAXONOMY );
+
+		// Check initial authorship data unset.
+		$authorship_authors = \Authorship\get_authors( $post1 );
+		$this->assertCount( 0, $authorship_authors );
+
+		$command = new CLI\Migrate_Command;
+		$command->wp_authors( [], [
+			'dry-run' => false,
+			'post-type' => 'post', // Note, have to set default values manually.
+		] );
+
+		// Check migration command has correctly set the author.
+		$authorship_authors = \Authorship\get_authors( $post1 );
+		$this->assertCount( 1, $authorship_authors );
+		$this->assertSame( self::$users['editor']->ID, $authorship_authors[0]->ID );
+	}
+
+	public function testMigratePostTypePage() : void {
+		$factory = self::factory()->post;
+
+		// Page. Owned by editor, attributed to nobody.
+		$page1 = $factory->create_and_get( [
+			'post_author' => self::$users['editor']->ID,
+			'post_type' => 'page',
+		] );
+
+		// Unset author data.
+		wp_set_post_terms( $page1->ID, [], TAXONOMY );
+
+		// Check initial authorship data unset.
+		$authorship_authors = \Authorship\get_authors( $page1 );
+		$this->assertCount( 0, $authorship_authors );
+
+		$command = new CLI\Migrate_Command();
+		$command->wp_authors( [], [
+			'dry-run' => false,
+			'post-type' => 'post,page',
+		] );
+
+		// Check migration command has correctly set the author.
+		$authorship_authors = \Authorship\get_authors( $page1 );
+		$this->assertCount( 1, $authorship_authors );
+		$this->assertSame( self::$users['editor']->ID, $authorship_authors[0]->ID );
+	}
+}