diff --git a/README.md b/README.md
index 1f0f81f..5164461 100644
--- a/README.md
+++ b/README.md
@@ -86,12 +86,14 @@ Release changes are noted on the [Releases](https://github.com/dmhendricks/wordp
 
 #### Branch: `master`
 
+* Set Carbon Fields minimum version to 2.2 (required for multisite example)
 * Extended base class as WordPress Toolkit; simplified base class configuration init
 * Moved `is_ajax()`/`prefix()` methods, `CacheObject()` init to wordpress-toolkit
 * Updated Composer license to conform to new [SPDX](https://spdx.org/licenses/) identifiers
 * Added [phpdotenv](https://github.com/etelford/phpdotenv) support ([reference](https://github.com/dmhendricks/wordpress-toolkit/wiki/ToolKit#environment))
 * Added `npm run zip-dev` to create installable ZIP including necessary development files
 * Added [Network Admin options page](https://github.com/dmhendricks/wordpress-base-plugin/blob/master/app/Settings/Network_Settings_Page.php) example
+* Modified `show_notice()` to allow displaying notices in Network Admin; add additional CSS classes and element ID
 
 ## Screenshot
 
diff --git a/app/Helpers.php b/app/Helpers.php
index b6f012d..10b60fd 100644
--- a/app/Helpers.php
+++ b/app/Helpers.php
@@ -1,5 +1,6 @@
 <?php
 namespace VendorName\PluginName;
+use WordPress_ToolKit\Helpers\ArrayHelper;
 use Carbon_Fields\Container;
 use Carbon_Fields\Field;
 
@@ -8,21 +9,45 @@ class Helpers extends Plugin {
   /**
     * Display a notice/message in WP Admin
     *
-    * @param string $msg The message to display.
-    * @param string $type The type of notice. Valid values:
-    *    error, warning, success, info
-    * @param bool $is_dismissible Specify whether or not the user may dismiss
-    *    the notice.
+    * @param string $msg The message to display
+    * @param string $args Configuration options
     * @since 2.0.0
     */
-  public static function show_notice( $msg, $type = 'error', $is_dismissible = false ) {
-
-    add_action( 'admin_notices', function() use ( &$msg, &$type, &$is_dismissible ) {
-
-      $class = 'notice notice-' . $type . ( $is_dismissible ? ' is-dismissible' : '' );
-      printf( '<div class="%1$s"><p>%2$s</p></div>', $class, $msg );
+  public static function show_notice( $msg, $args = array() ) {
+
+    $args = ArrayHelper::set_default_atts( array(
+      'type' => 'success', // 'error', 'warning', 'success', 'info'
+      'dismissible' => true, // notice is dismissible
+      'scope' => true, // 'admin', 'network', true (both)
+      'class' => null, // additional CSS classes to add to notice
+      'id' => null // container element ID
+    ), $args);
+
+    // Merge CSS classes
+    if( !is_array( $args['class'] ) ) $args['class'] = explode( ' ', $args['class'] );
+    $classes = array_merge([
+      'notice',
+      'notice-' . $args['type']
+    ], $args['class'] );
+    if( $args['dismissible'] ) $classes[] = 'is-dismissible';
+    $classes = implode( ' ', array_filter( $classes ) );
+
+    // Set ID string, if specified
+    $element_id = $args['id'] ? ' id="' . $args['id'] . '"' : '';
+
+    // Display message in WP Admin
+    if( $args['scope'] === true || $args['scope'] == 'admin' ) {
+      add_action( 'admin_notices', function() use ( &$classes, &$element_id, &$msg ) {
+        printf( '<div class="%1$s"%2$s><p>%3$s</p></div>', $classes, $element_id, $msg );
+      });
+    }
 
-    });
+    // Display message in Network Admin
+    if( $args['scope'] === true || $args['scope'] == 'network' ) {
+      add_action( 'network_admin_notices', function() use ( &$classes, &$element_id, &$msg ) {
+        printf( '<div class="%1$s"%2$s><p>%3$s</p></div>', $classes, $element_id, $msg );
+      });
+    }
 
   }
 
diff --git a/app/Plugin.php b/app/Plugin.php
index 1b1271e..d3404af 100644
--- a/app/Plugin.php
+++ b/app/Plugin.php
@@ -168,7 +168,7 @@ private function verify_dependencies( $deps = true, $args = array() ) {
       $notices = '<ul><li>' . implode( "</li>\n<li>", $notices ) . '</li></ul>';
 
       if( $args['echo'] ) {
-        Helpers::show_notice($notices, 'error', false);
+        Helpers::show_notice( $notices, [ 'type' => 'error', 'dismissible' => false ] );
         return false;
       } else {
         return $notices;