diff --git a/inc/helpers/namespace.php b/inc/helpers/namespace.php
index 1474253..482b53d 100644
--- a/inc/helpers/namespace.php
+++ b/inc/helpers/namespace.php
@@ -167,7 +167,7 @@ function get_available_subjects( $catalog_data ) {
  * @return string $items
  */
 function get_default_menu( $items = '' ) {
-	$id_items = [
+	$item_classes = [
 		'prefix' => 'nav--primary-item',
 		'Home' => 'home',
 		'Contact' => 'contact',
@@ -184,16 +184,16 @@ function get_default_menu( $items = '' ) {
 		'<li class="%3$s %3$s-%4$s"><a href="%1$s">%2$s</a></li>',
 		$link,
 		__( 'Home', 'pressbooks-aldine' ),
-		$id_items['prefix'],
-		$id_items['Home']
+		$item_classes['prefix'],
+		$item_classes['Home']
 	) . $items;
 	if ( get_option( 'pb_network_contact_form' ) ) {
 		$items .= sprintf(
 			'<li class="%3$s %3$s-%4$s"><a href="%1$s">%2$s</a></li>',
 			'#contact',
 			__( 'Contact', 'pressbooks-aldine' ),
-			$id_items['prefix'],
-			$id_items['Contact']
+			$item_classes['prefix'],
+			$item_classes['Contact']
 		);
 	}
 	if ( ! is_user_logged_in() ) {
@@ -201,16 +201,16 @@ function get_default_menu( $items = '' ) {
 			'<li class="%3$s %3$s-%4$s"><a href="%1$s">%2$s</a></li>',
 			wp_login_url( get_permalink() ),
 			__( 'Sign In', 'pressbooks-aldine' ),
-			$id_items['prefix'],
-			$id_items['SignIn']
+			$item_classes['prefix'],
+			$item_classes['SignIn']
 		);
 		if ( in_array( get_site_option( 'registration' ), [ 'user', 'all' ], true ) ) {
 			$items .= sprintf(
 				'<li class="%3$s %3$s-%4$s"><a href="%1$s">%2$s</a></li>',
 				network_home_url( '/wp-signup.php' ),
 				__( 'Sign Up', 'pressbooks-aldine' ),
-				$id_items['prefix'],
-				$id_items['SignUp']
+				$item_classes['prefix'],
+				$item_classes['SignUp']
 			);
 		}
 	} else {
@@ -219,16 +219,16 @@ function get_default_menu( $items = '' ) {
 				'<li class="%3$s %3$s-%4$s"><a href="%1$s">%2$s</a></li>',
 				admin_url(),
 				__( 'Admin', 'pressbooks-aldine' ),
-				$id_items['prefix'],
-				$id_items['Admin']
+				$item_classes['prefix'],
+				$item_classes['Admin']
 			);
 		} else {
 			$items .= sprintf(
 				'<li class="%3$s %3$s-%4$s"><a href="%1$s">%2$s</a></li>',
 				user_admin_url(),
 				__( 'Admin', 'pressbooks-aldine' ),
-				$id_items['prefix'],
-				$id_items['Admin']
+				$item_classes['prefix'],
+				$item_classes['Admin']
 			);
 		}
 		$user_info = get_userdata( get_current_user_id() );
@@ -237,24 +237,24 @@ function get_default_menu( $items = '' ) {
 				'<li class="%3$s %3$s-%4$s"><a href="%1$s">%2$s</a></li>',
 				get_blogaddress_by_id( $user_info->primary_blog ) . 'wp-admin/index.php?page=pb_catalog',
 				__( 'My Books', 'pressbooks-aldine' ),
-				$id_items['prefix'],
-				$id_items['MyBooks']
+				$item_classes['prefix'],
+				$item_classes['MyBooks']
 			);
 		} elseif ( in_array( get_site_option( 'registration' ), [ 'blog', 'all' ], true ) ) {
 			$items .= sprintf(
 				'<li class="%3$s %3$s-%4$s"><a href="%1$s">%2$s</a></li>',
 				network_home_url( '/wp-signup.php' ),
 				__( 'Create a New Book', 'pressbooks-aldine' ),
-				$id_items['prefix'],
-				$id_items['CreateANewBook']
+				$item_classes['prefix'],
+				$item_classes['CreateANewBook']
 			);
 		}
 		$items .= sprintf(
 			'<li class="%3$s %3$s-%4$s"><a href="%1$s">%2$s</a></li>',
 			wp_logout_url( get_permalink() ),
 			__( 'Sign Out', 'pressbooks-aldine' ),
-			$id_items['prefix'],
-			$id_items['SignOut']
+			$item_classes['prefix'],
+			$item_classes['SignOut']
 		);
 	}
 	/* @codingStandardsIgnoreStart $items .= sprintf(