diff --git a/wp-admin/user-new.php b/wp-admin/user-new.php
index ccae15ff26..273fa00a26 100644
--- a/wp-admin/user-new.php
+++ b/wp-admin/user-new.php
@@ -111,12 +111,19 @@ Please click the following link to confirm the invite:
 			die();
 		}
 	} else {
-		// Adding a new user to this blog
+		// Adding a new user to this site
 		$user_details = wpmu_validate_user_signup( $_REQUEST[ 'user_login' ], $_REQUEST[ 'email' ] );
 		if ( is_wp_error( $user_details[ 'errors' ] ) && !empty( $user_details[ 'errors' ]->errors ) ) {
 			$add_user_errors = $user_details[ 'errors' ];
 		} else {
-			$new_user_login = apply_filters('pre_user_login', sanitize_user(wp_unslash($_REQUEST['user_login']), true));
+			/** 
+			 * Filter the user_login, aka the username, before it is added to the site.
+			 * 
+			 * @since 3.0.0
+			 * 
+			 * @param string $_REQUEST['user_login'] The sanitized username. 
+			 */ 
+			$new_user_login = apply_filters( 'pre_user_login', sanitize_user( wp_unslash( $_REQUEST['user_login'] ), true ) );
 			if ( isset( $_POST[ 'noconfirmation' ] ) && is_super_admin() ) {
 				add_filter( 'wpmu_signup_user_notification', '__return_false' ); // Disable confirmation email
 			}
@@ -181,6 +188,13 @@ get_current_screen()->set_help_sidebar(
 wp_enqueue_script('wp-ajax-response');
 wp_enqueue_script('user-profile');
 
+/** 
+ * Allows you to enable user auto-complete for non-super admins in multisite.
+ * 
+ * @since 3.4.0
+ * 
+ * @param bool True or false, based on if you enable auto-complete for non-super admins. Default is false.
+ */ 
 if ( is_multisite() && current_user_can( 'promote_users' ) && ! wp_is_large_network( 'users' )
 	&& ( is_super_admin() || apply_filters( 'autocomplete_users_for_site_admins', false ) )
 ) {
@@ -266,6 +280,13 @@ if ( is_multisite() ) {
 		$label = __('E-mail or Username');
 	}
 ?>
+<?php
+/** 
+ * Fires inside the adduser form tag.
+ * 
+ * @since 3.0.0
+ */ 
+?>
 <form action="" method="post" name="adduser" id="adduser" class="validate"<?php do_action('user_new_form_tag');?>>
 <input name="action" type="hidden" value="adduser" />
 <?php wp_nonce_field( 'add-user', '_wpnonce_add-user' ) ?>
@@ -299,6 +320,9 @@ if ( current_user_can( 'create_users') ) {
 		echo '<h3 id="create-new-user">' . __( 'Add New User' ) . '</h3>';
 ?>
 <p><?php _e('Create a brand new user and add them to this site.'); ?></p>
+<?php
+//duplicate_hook
+?>
 <form action="" method="post" name="createuser" id="createuser" class="validate"<?php do_action('user_new_form_tag');?>>
 <input name="action" type="hidden" value="createuser" />
 <?php wp_nonce_field( 'create-user', '_wpnonce_create-user' ) ?>
@@ -338,7 +362,15 @@ foreach ( array( 'user_login' => 'login', 'first_name' => 'firstname', 'last_nam
 		<th scope="row"><label for="url"><?php _e('Website') ?></label></th>
 		<td><input name="url" type="text" id="url" class="code" value="<?php echo esc_attr($new_user_uri); ?>" /></td>
 	</tr>
-<?php if ( apply_filters('show_password_fields', true) ) : ?>
+<?php 
+/** 
+ * Filter the display of the password fields.
+ * 
+ * @since 1.5.1
+ * 
+ * @param bool True or false, based on if you want to show the password fields. Default is true.
+ */ 
+if ( apply_filters( 'show_password_fields', true ) ) : ?>
 	<tr class="form-field form-required">
 		<th scope="row"><label for="pass1"><?php _e('Password'); ?> <span class="description"><?php /* translators: password input field */_e('(required)'); ?></span></label></th>
 		<td>