diff --git a/src/wp-includes/comment-template.php b/src/wp-includes/comment-template.php
index 766548f6a0..b10fe1415e 100644
--- a/src/wp-includes/comment-template.php
+++ b/src/wp-includes/comment-template.php
@@ -2428,6 +2428,15 @@ function comment_form( $args = array(), $post_id = null ) {
 	// Ensure that the filtered args contain all required default values.
 	$args = array_merge( $defaults, $args );
 
+	// Remove aria-describedby from the email field if there's no associated description.
+	if ( false === strpos( $args['comment_notes_before'], 'id="email-notes"' ) ) {
+		$args['fields']['email'] = str_replace(
+			' aria-describedby="email-notes"',
+			'',
+			$args['fields']['email']
+		);
+	}
+
 	/**
 	 * Fires before the comment form.
 	 *
@@ -2509,7 +2518,7 @@ function comment_form( $args = array(), $post_id = null ) {
 
 			endif;
 
-			// Prepare an array of all fields, including the textarea
+			// Prepare an array of all fields, including the textarea.
 			$comment_fields = array( 'comment' => $args['comment_field'] ) + (array) $args['fields'];
 
 			/**
diff --git a/tests/phpunit/tests/comment/commentForm.php b/tests/phpunit/tests/comment/commentForm.php
index 0fabd97a6a..a03801438d 100644
--- a/tests/phpunit/tests/comment/commentForm.php
+++ b/tests/phpunit/tests/comment/commentForm.php
@@ -13,6 +13,7 @@ class Tests_Comment_CommentForm extends WP_UnitTestCase {
 			'class_submit' => 'foo-class',
 			'label_submit' => 'foo-label',
 		);
+
 		$form = get_echo( 'comment_form', array( $args, $p ) );
 
 		$button = '<input name="foo-name" type="submit" id="foo-id" class="foo-class" value="foo-label" />';
@@ -30,6 +31,7 @@ class Tests_Comment_CommentForm extends WP_UnitTestCase {
 			'label_submit'  => 'foo-label',
 			'submit_button' => '<input name="custom-%1$s" type="submit" id="custom-%2$s" class="custom-%3$s" value="custom-%4$s" />',
 		);
+
 		$form = get_echo( 'comment_form', array( $args, $p ) );
 
 		$button = '<input name="custom-foo-name" type="submit" id="custom-foo-id" class="custom-foo-class" value="custom-foo-label" />';
@@ -46,6 +48,7 @@ class Tests_Comment_CommentForm extends WP_UnitTestCase {
 			'label_submit' => 'foo-label',
 			'submit_field' => '<p class="my-custom-submit-field">%1$s %2$s</p>',
 		);
+
 		$form = get_echo( 'comment_form', array( $args, $p ) );
 
 		$button = '<input name="foo-name" type="submit" id="foo-id" class="foo-class" value="foo-label" />';
@@ -94,10 +97,30 @@ class Tests_Comment_CommentForm extends WP_UnitTestCase {
 				'author' => 'Hello World!',
 			),
 		);
+
 		$form = get_echo( 'comment_form', array( $args, $p ) );
 
 		remove_filter( 'option_show_comments_cookies_opt_in', '__return_true' );
 
 		$this->assertRegExp( '|<p class="comment\-form\-cookies\-consent">.*?</p>|', $form );
 	}
+
+	/**
+	 * @ticket 47975
+	 */
+	public function test_aria_describedby_email_notes_should_not_be_added_if_no_email_notes() {
+		$p = self::factory()->post->create();
+
+		$form_with_aria = get_echo( 'comment_form', array( array(), $p ) );
+
+		$this->assertContains( 'aria-describedby="email-notes"', $form_with_aria );
+
+		$args = array(
+			'comment_notes_before' => '',
+		);
+
+		$form_without_aria = get_echo( 'comment_form', array( $args, $p ) );
+
+		$this->assertNotContains( 'aria-describedby="email-notes"', $form_without_aria );
+	}
 }