diff --git a/templates/emails/admin-cancelled-order.php b/templates/emails/admin-cancelled-order.php
index 0b11356a019..65f95ff3797 100644
--- a/templates/emails/admin-cancelled-order.php
+++ b/templates/emails/admin-cancelled-order.php
@@ -49,7 +49,7 @@ do_action( 'woocommerce_email_order_meta', $order, $sent_to_admin, $plain_text,
 do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_text, $email );
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo wp_kses_post( wpautop( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/admin-failed-order.php b/templates/emails/admin-failed-order.php
index b4c79366401..528492b6d6e 100644
--- a/templates/emails/admin-failed-order.php
+++ b/templates/emails/admin-failed-order.php
@@ -49,7 +49,7 @@ do_action( 'woocommerce_email_order_meta', $order, $sent_to_admin, $plain_text,
 do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_text, $email );
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo wp_kses_post( wpautop( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/admin-new-order.php b/templates/emails/admin-new-order.php
index d5c851d0a4d..cefa3439f66 100644
--- a/templates/emails/admin-new-order.php
+++ b/templates/emails/admin-new-order.php
@@ -46,7 +46,7 @@ do_action( 'woocommerce_email_order_meta', $order, $sent_to_admin, $plain_text,
 do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_text, $email );
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo wp_kses_post( wpautop( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/customer-completed-order.php b/templates/emails/customer-completed-order.php
index d372e41427e..bfe244e0233 100644
--- a/templates/emails/customer-completed-order.php
+++ b/templates/emails/customer-completed-order.php
@@ -50,7 +50,7 @@ do_action( 'woocommerce_email_order_meta', $order, $sent_to_admin, $plain_text,
 do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_text, $email );
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo wp_kses_post( wpautop( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/customer-invoice.php b/templates/emails/customer-invoice.php
index 60a6d36e715..1fd444d14e4 100644
--- a/templates/emails/customer-invoice.php
+++ b/templates/emails/customer-invoice.php
@@ -84,7 +84,7 @@ do_action( 'woocommerce_email_order_meta', $order, $sent_to_admin, $plain_text,
 do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_text, $email );
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo wp_kses_post( wpautop( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/customer-new-account.php b/templates/emails/customer-new-account.php
index 9e32d01f1b4..a6bc15711b4 100644
--- a/templates/emails/customer-new-account.php
+++ b/templates/emails/customer-new-account.php
@@ -30,7 +30,7 @@ do_action( 'woocommerce_email_header', $email_heading, $email ); ?>
 
 <?php
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo wp_kses_post( wpautop( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/customer-note.php b/templates/emails/customer-note.php
index 3949001ca51..696e081c26f 100644
--- a/templates/emails/customer-note.php
+++ b/templates/emails/customer-note.php
@@ -54,7 +54,7 @@ do_action( 'woocommerce_email_order_meta', $order, $sent_to_admin, $plain_text,
 do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_text, $email );
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo wp_kses_post( wpautop( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/customer-on-hold-order.php b/templates/emails/customer-on-hold-order.php
index 39422a2c0e4..36ca694a174 100644
--- a/templates/emails/customer-on-hold-order.php
+++ b/templates/emails/customer-on-hold-order.php
@@ -48,7 +48,7 @@ do_action( 'woocommerce_email_order_meta', $order, $sent_to_admin, $plain_text,
 do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_text, $email );
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo wp_kses_post( wpautop( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/customer-processing-order.php b/templates/emails/customer-processing-order.php
index 4cfbc7029a7..798763aa024 100644
--- a/templates/emails/customer-processing-order.php
+++ b/templates/emails/customer-processing-order.php
@@ -51,7 +51,7 @@ do_action( 'woocommerce_email_order_meta', $order, $sent_to_admin, $plain_text,
 do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_text, $email );
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo wp_kses_post( wpautop( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/customer-refunded-order.php b/templates/emails/customer-refunded-order.php
index a44af11a100..d2bdbe981e9 100644
--- a/templates/emails/customer-refunded-order.php
+++ b/templates/emails/customer-refunded-order.php
@@ -58,7 +58,7 @@ do_action( 'woocommerce_email_order_meta', $order, $sent_to_admin, $plain_text,
 do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_text, $email );
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo wp_kses_post( wpautop( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/customer-reset-password.php b/templates/emails/customer-reset-password.php
index b7eb95cb666..e0dbde9c886 100644
--- a/templates/emails/customer-reset-password.php
+++ b/templates/emails/customer-reset-password.php
@@ -38,7 +38,7 @@ if ( ! defined( 'ABSPATH' ) ) {
 
 <?php
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo wp_kses_post( wpautop( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/plain/admin-cancelled-order.php b/templates/emails/plain/admin-cancelled-order.php
index 2cdaeb1e043..6fce661d044 100644
--- a/templates/emails/plain/admin-cancelled-order.php
+++ b/templates/emails/plain/admin-cancelled-order.php
@@ -48,7 +48,7 @@ do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_
 echo "\n\n----------------------------------------\n\n";
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo esc_html( wp_strip_all_tags( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/plain/admin-failed-order.php b/templates/emails/plain/admin-failed-order.php
index edc73e6e3a3..9c0cd2441b1 100644
--- a/templates/emails/plain/admin-failed-order.php
+++ b/templates/emails/plain/admin-failed-order.php
@@ -48,7 +48,7 @@ do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_
 echo "\n\n----------------------------------------\n\n";
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo esc_html( wp_strip_all_tags( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/plain/admin-new-order.php b/templates/emails/plain/admin-new-order.php
index 3755f9898b8..82efa4259a3 100644
--- a/templates/emails/plain/admin-new-order.php
+++ b/templates/emails/plain/admin-new-order.php
@@ -48,7 +48,7 @@ do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_
 echo "\n\n----------------------------------------\n\n";
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo esc_html( wp_strip_all_tags( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/plain/customer-completed-order.php b/templates/emails/plain/customer-completed-order.php
index d8c4e48936c..129556b4940 100644
--- a/templates/emails/plain/customer-completed-order.php
+++ b/templates/emails/plain/customer-completed-order.php
@@ -50,7 +50,7 @@ do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_
 echo "\n\n----------------------------------------\n\n";
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo esc_html( wp_strip_all_tags( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/plain/customer-invoice.php b/templates/emails/plain/customer-invoice.php
index fbbadd00ebc..7ac537fbb0b 100644
--- a/templates/emails/plain/customer-invoice.php
+++ b/templates/emails/plain/customer-invoice.php
@@ -69,7 +69,7 @@ do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_
 echo "\n\n----------------------------------------\n\n";
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo esc_html( wp_strip_all_tags( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/plain/customer-new-account.php b/templates/emails/plain/customer-new-account.php
index 65ad030d13e..f2b309a703f 100644
--- a/templates/emails/plain/customer-new-account.php
+++ b/templates/emails/plain/customer-new-account.php
@@ -34,7 +34,7 @@ if ( 'yes' === get_option( 'woocommerce_registration_generate_password' ) && $pa
 echo "\n\n----------------------------------------\n\n";
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo esc_html( wp_strip_all_tags( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/plain/customer-note.php b/templates/emails/plain/customer-note.php
index a691c129146..a1eb4fde089 100644
--- a/templates/emails/plain/customer-note.php
+++ b/templates/emails/plain/customer-note.php
@@ -57,7 +57,7 @@ do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_
 echo "\n\n----------------------------------------\n\n";
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo esc_html( wp_strip_all_tags( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/plain/customer-on-hold-order.php b/templates/emails/plain/customer-on-hold-order.php
index 867f4b24317..3a5ba46b744 100644
--- a/templates/emails/plain/customer-on-hold-order.php
+++ b/templates/emails/plain/customer-on-hold-order.php
@@ -49,7 +49,7 @@ do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_
 echo "\n\n----------------------------------------\n\n";
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo esc_html( wp_strip_all_tags( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/plain/customer-processing-order.php b/templates/emails/plain/customer-processing-order.php
index 203bc1233f2..57c8860c2a6 100644
--- a/templates/emails/plain/customer-processing-order.php
+++ b/templates/emails/plain/customer-processing-order.php
@@ -50,7 +50,7 @@ do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_
 echo "\n\n----------------------------------------\n\n";
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo esc_html( wp_strip_all_tags( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/plain/customer-refunded-order.php b/templates/emails/plain/customer-refunded-order.php
index 78548554660..1aa31a53bb8 100644
--- a/templates/emails/plain/customer-refunded-order.php
+++ b/templates/emails/plain/customer-refunded-order.php
@@ -55,7 +55,7 @@ do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_
 echo "\n\n----------------------------------------\n\n";
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo esc_html( wp_strip_all_tags( wptexturize( $additional_content ) ) );
diff --git a/templates/emails/plain/customer-reset-password.php b/templates/emails/plain/customer-reset-password.php
index a93cdbc0eaa..be81aee975f 100644
--- a/templates/emails/plain/customer-reset-password.php
+++ b/templates/emails/plain/customer-reset-password.php
@@ -33,7 +33,7 @@ echo esc_url( add_query_arg( array( 'key' => $reset_key, 'id' => $user_id ), wc_
 echo "\n\n----------------------------------------\n\n";
 
 /**
- * Show user-defined additonal content - this is set in each email's settings.
+ * Show user-defined additional content - this is set in each email's settings.
  */
 if ( $additional_content ) {
 	echo esc_html( wp_strip_all_tags( wptexturize( $additional_content ) ) );