Index: src/wp-content/themes/twentyfifteen/inc/customizer.php
===================================================================
--- src/wp-content/themes/twentyfifteen/inc/customizer.php	(revision 30732)
+++ src/wp-content/themes/twentyfifteen/inc/customizer.php	(working copy)
@@ -49,7 +49,7 @@
 
 	$wp_customize->add_control( new WP_Customize_Color_Control( $wp_customize, 'sidebar_textcolor', array(
 		'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' ),
+		'description' => esc_html__( 'Applied to the header on small screens and the sidebar on wide screens.', 'twentyfifteen' ),
 		'section'     => 'colors',
 	) ) );
 
@@ -65,7 +65,7 @@
 
 	$wp_customize->add_control( new WP_Customize_Color_Control( $wp_customize, 'header_background_color', array(
 		'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' ),
+		'description' => esc_html__( 'Applied to the header on small screens and the sidebar on wide screens.', 'twentyfifteen' ),
 		'section'     => 'colors',
 	) ) );
 
Index: src/wp-content/themes/twentyfifteen/languages/twentyfifteen.pot
===================================================================
--- src/wp-content/themes/twentyfifteen/languages/twentyfifteen.pot	(revision 30732)
+++ src/wp-content/themes/twentyfifteen/languages/twentyfifteen.pot	(working copy)
@@ -4,7 +4,7 @@
 msgstr ""
 "Project-Id-Version: Twenty Fifteen 1.0\n"
 "Report-Msgid-Bugs-To: http://wordpress.org/tags/twentyfifteen\n"
-"POT-Creation-Date: 2014-11-25 16:39:33+00:00\n"
+"POT-Creation-Date: 2014-12-03 19:08:03+00:00\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
@@ -20,15 +20,15 @@
 msgid "It looks like nothing was found at this location. Maybe try a search?"
 msgstr ""
 
-#: archive.php:50 index.php:46 search.php:38
+#: archive.php:49 index.php:46 search.php:38
 msgid "Previous page"
 msgstr ""
 
-#: archive.php:51 index.php:47 search.php:39
+#: archive.php:50 index.php:47 search.php:39
 msgid "Next page"
 msgstr ""
 
-#: archive.php:52 content-link.php:40 content-page.php:29 content.php:42
+#: archive.php:51 content-link.php:40 content-page.php:29 content.php:42
 #: image.php:63 index.php:48 search.php:40
 msgid "Page"
 msgstr ""
@@ -53,7 +53,7 @@
 msgstr ""
 
 #. translators: %s: Name of current post
-#: content-link.php:31 content.php:33 inc/template-tags.php:235
+#: content-link.php:31 content.php:33 inc/template-tags.php:237
 msgid "Continue reading %s"
 msgstr ""
 
@@ -179,9 +179,7 @@
 msgstr ""
 
 #: inc/customizer.php:52 inc/customizer.php:68
-msgid ""
-"Only applied to the sidebar on wider screens. On small screens the sidebar "
-"will become the header."
+msgid "Applied to the header on small screens and the sidebar on wide screens."
 msgstr ""
 
 #: inc/customizer.php:67
@@ -194,27 +192,27 @@
 "applied to the header."
 msgstr ""
 
-#: inc/customizer.php:96
+#: inc/customizer.php:97
 msgid "Default"
 msgstr ""
 
-#: inc/customizer.php:107
+#: inc/customizer.php:108
 msgid "Dark"
 msgstr ""
 
-#: inc/customizer.php:118
+#: inc/customizer.php:119
 msgid "Yellow"
 msgstr ""
 
-#: inc/customizer.php:129
+#: inc/customizer.php:130
 msgid "Pink"
 msgstr ""
 
-#: inc/customizer.php:140
+#: inc/customizer.php:141
 msgid "Purple"
 msgstr ""
 
-#: inc/customizer.php:151
+#: inc/customizer.php:152
 msgid "Blue"
 msgstr ""