diff --git a/htdocs/wp-content/themes/lawcarta/functions.php b/htdocs/wp-content/themes/lawcarta/functions.php
index aff19ac..138ee4c 100644
--- a/htdocs/wp-content/themes/lawcarta/functions.php
+++ b/htdocs/wp-content/themes/lawcarta/functions.php
@@ -289,3 +289,69 @@ function add_custom_class($classes=array(), $menu_item=false) {
 }
 add_filter('nav_menu_css_class', 'add_custom_class', 100, 2);
 
+/**
+ * Add Disallow for some file types.
+ * Add "Disallow: /wp-login.php/\n".
+ * Remove "Allow: /wp-admin/admin-ajax.php\n".
+ * Calculate and add a "Sitemap:" link.
+ */
+add_filter( 'robots_txt', function( $output, $public ) {
+    /**
+     * If "Search engine visibility" is disabled,
+     * strongly tell all robots to go away.
+     */
+    if ( '0' == $public || LAWCARTA_ENVIRONMENT_NAME != 'prod') {
+        $output = "User-agent: *\nDisallow: /\nDisallow: /*\nDisallow: /*?\n";
+    } else {
+        /**
+         * Disallow some file types
+         */
+        foreach( array( 'jpeg','jpg','gif','png','mp4','webm','woff','woff2','ttf','eot' ) as $ext ) {
+            $output .= "Disallow: /*.{$ext}$\n";
+        }
+
+        /**
+         * Get site path.
+         */
+        $site_url = parse_url( site_url() );
+        $path     = ( ! empty( $site_url['path'] ) ) ? $site_url['path'] : '';
+
+        /**
+         * Add new disallow.
+         */
+        $output .= "Disallow: $path/wp-login.php\n";
+
+        /**
+         * Remove line that allows robots to access AJAX interface.
+         */
+        $robots = preg_replace( '/Allow: [^\0\s]*\/wp-admin\/admin-ajax\.php\n/', '', $output );
+
+        /**
+         * If no error occurred, replace $output with modified value.
+         */
+        if ( ! is_null( robots ) ) {
+            $output = $robots;
+        }
+
+        /**
+         * Remove line Sitemap.
+         */
+        $robots = preg_replace( '/Sitemap: [^\0\s]*\n/', '', $output );
+
+        /**
+         * If no error occurred, replace $output with modified value.
+         */
+        if ( ! is_null( robots ) ) {
+            $output = $robots;
+        }
+
+        /**
+         * Calculate and add a "Sitemap:" link.
+         * Modify as needed.
+         */
+        $output .= "Sitemap: {$site_url['scheme']}://{$site_url[ 'host' ]}/wp-sitemap.xml\n";
+    }
+
+    return $output;
+
+}, 99, 2 );  // Priority 99, Number of Arguments 2.
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