diff --git a/src/wp-admin/includes/media.php b/src/wp-admin/includes/media.php
index 8436bde73b7fa..ee5339d13fe92 100644
--- a/src/wp-admin/includes/media.php
+++ b/src/wp-admin/includes/media.php
@@ -3237,8 +3237,8 @@ function edit_form_image_editor( $post ) {
 		<?php
 
 		printf(
-			/* translators: 1: Link to tutorial, 2: Additional link attributes, 3: Accessibility text. */
-			__( '<a href="%1$s" %2$s>Learn how to describe the purpose of the image%3$s</a>. Leave empty if the image is purely decorative.' ),
+			/* translators: 1: Link to tutorial, 2: Additional link attributes, 3: Accessibility text, 4: External link icon. */
+			__( 'Alt text describes the image\'s purpose. Leave it blank if the image is purely decorative. <a href="%1$s" %2$s>Learn more about alt text%3$s</a>.%4$s' ),
 			/* translators: Localized tutorial, if one exists. W3C Web Accessibility Initiative link has list of existing translations. */
 			esc_url( __( 'https://www.w3.org/WAI/tutorials/images/decision-tree/' ) ),
 			'target="_blank"',
@@ -3246,7 +3246,8 @@ function edit_form_image_editor( $post ) {
 				'<span class="screen-reader-text"> %s</span>',
 				/* translators: Hidden accessibility text. */
 				__( '(opens in a new tab)' )
-			)
+			),
+			'<span aria-hidden="true" class="dashicons dashicons-external"></span>'
 		);
 
 		?>
diff --git a/src/wp-includes/media-template.php b/src/wp-includes/media-template.php
index 21b66d088caa4..92928a64adc08 100644
--- a/src/wp-includes/media-template.php
+++ b/src/wp-includes/media-template.php
@@ -157,8 +157,8 @@ function wp_print_media_templates() {
 	$class = 'media-modal wp-core-ui';
 
 	$alt_text_description = sprintf(
-		/* translators: 1: Link to tutorial, 2: Additional link attributes, 3: Accessibility text. */
-		__( '<a href="%1$s" %2$s>Learn how to describe the purpose of the image%3$s</a>. Leave empty if the image is purely decorative.' ),
+		/* translators: 1: Link to tutorial, 2: Additional link attributes, 3: Accessibility text, 4: External link icon. */
+		__( 'Alt text describes the image\'s purpose. Leave it blank if the image is purely decorative. <a href="%1$s" %2$s>Learn more about alt text%3$s</a>.%4$s' ),
 		/* translators: Localized tutorial, if one exists. W3C Web Accessibility Initiative link has list of existing translations. */
 		esc_url( __( 'https://www.w3.org/WAI/tutorials/images/decision-tree/' ) ),
 		'target="_blank"',
@@ -166,7 +166,8 @@ function wp_print_media_templates() {
 			'<span class="screen-reader-text"> %s</span>',
 			/* translators: Hidden accessibility text. */
 			__( '(opens in a new tab)' )
-		)
+		),
+		'<span aria-hidden="true" class="dashicons dashicons-external"></span>'
 	);
 	?>