diff --git a/src/wp-content/themes/twentyfifteen/inc/customizer.php b/src/wp-content/themes/twentyfifteen/inc/customizer.php
index e8821440db..4b9c2c7f2c 100644
--- a/src/wp-content/themes/twentyfifteen/inc/customizer.php
+++ b/src/wp-content/themes/twentyfifteen/inc/customizer.php
@@ -42,8 +42,9 @@ function twentyfifteen_customize_register( $wp_customize ) {
 	) );
 
 	$wp_customize->add_control( new WP_Customize_Color_Control( $wp_customize, 'sidebar_textcolor', array(
-		'label'   => esc_html__( 'Header & Sidebar Text Color', 'twentyfifteen' ),
-		'section' => 'colors',
+		'label'       => esc_html__( 'Header and Sidebar Text Color', 'twentyfifteen' ),
+		'description' => esc_html__( 'Only applied to the sidebar on wider screens. On small screens the sidebar will become the header.', 'twentyfifteen' ),
+		'section'     => 'colors',
 	) ) );
 
 	// Remove the core header textcolor control, as it shares the sidebar text color.
@@ -56,9 +57,13 @@ function twentyfifteen_customize_register( $wp_customize ) {
 	) );
 
 	$wp_customize->add_control( new WP_Customize_Color_Control( $wp_customize, 'header_background_color', array(
-		'label'   => esc_html__( 'Header & Sidebar Background Color', 'twentyfifteen' ),
-		'section' => 'colors',
+		'label'       => esc_html__( 'Header and Sidebar Background Color', 'twentyfifteen' ),
+		'description' => esc_html__( 'Only applied to the sidebar on wider screens. On small screens the sidebar will become the header.', 'twentyfifteen' ),
+		'section'     => 'colors',
 	) ) );
+
+	// Add an additional description to the header image section.
+	$wp_customize->get_section( 'header_image' )->description = esc_html__( 'Only applied to the sidebar on wide screens. On small screens it will be applied to the header.', 'twentyfifteen' );
 }
 add_action( 'customize_register', 'twentyfifteen_customize_register', 11 );