diff --git a/wp-admin/customize.php b/wp-admin/customize.php
index 262c77abf2..51335829f0 100644
--- a/wp-admin/customize.php
+++ b/wp-admin/customize.php
@@ -170,7 +170,7 @@ do_action( 'customize_controls_print_styles' );
 do_action( 'customize_controls_print_scripts' );
 
 /**
- * Fires when Customizer control scripts are printed.
+ * Fires in head section of Customizer controls.
  *
  * @since 5.5.0
  */
diff --git a/wp-admin/includes/misc.php b/wp-admin/includes/misc.php
index d17c2ef232..2b90ad504e 100644
--- a/wp-admin/includes/misc.php
+++ b/wp-admin/includes/misc.php
@@ -1027,21 +1027,26 @@ function wp_admin_viewport_meta() {
 	 * @param string $viewport_meta The viewport meta.
 	 */
 	$viewport_meta = apply_filters( 'admin_viewport_meta', 'width=device-width,initial-scale=1.0' );
+
 	if ( empty( $viewport_meta ) ) {
 		return;
 	}
+
 	echo '<meta name="viewport" content="' . esc_attr( $viewport_meta ) . '">';
 }
 
 /**
- * Viewport meta for mobile in customize.
+ * Adds viewport meta for mobile in Customizer.
  *
  * Hooked to the {@see 'admin_viewport_meta'} filter.
  *
  * @since 5.5.0
+ *
+ * @param string $viewport_meta The viewport meta.
+ * @return string Filtered viewport meta.
  */
-function _customizer_mobile_viewport_meta( $content ) {
-	return trim( $content, ',' ) . ',minimum-scale=0.5,maximum-scale=1.2';
+function _customizer_mobile_viewport_meta( $viewport_meta ) {
+	return trim( $viewport_meta, ',' ) . ',minimum-scale=0.5,maximum-scale=1.2';
 }
 
 /**
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 3fcca7a084..8ca208a78f 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.5-beta1-48419';
+$wp_version = '5.5-beta1-48420';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.