diff --git a/examples/contentsutf8.html b/examples/contentsutf8.html
index 219fec2d..f94260e0 100644
--- a/examples/contentsutf8.html
+++ b/examples/contentsutf8.html
@@ -10,7 +10,7 @@
   <div align="center">
     <a href="https://github.com/PHPMailer/PHPMailer/"><img src="images/phpmailer.png" height="90" width="340" alt="PHPMailer rocks"></a>
   </div>
-  <p>This example uses <strong>HTML</strong> with the UTF-8 unicode charset.</p>
+  <p>This example uses <strong>HTML</strong> with the UTF-8 Unicode charset.</p>
   <p>Chinese text: 郵件內容為空</p>
   <p>Russian text: Пустое тело сообщения</p>
   <p>Armenian text: Հաղորդագրությունը դատարկ է</p>
diff --git a/src/PHPMailer.php b/src/PHPMailer.php
index 0a31f476..18108994 100644
--- a/src/PHPMailer.php
+++ b/src/PHPMailer.php
@@ -1588,10 +1588,10 @@ class PHPMailer
             $this->error_count = 0; //Reset errors
             $this->mailHeader = '';
 
-            //The code below tries to support full use of unicode,
+            //The code below tries to support full use of Unicode,
             //while remaining compatible with legacy SMTP servers to
             //the greatest degree possible: If the message uses
-            //unicode in the localparts of any addresses, it is sent
+            //Unicode in the localparts of any addresses, it is sent
             //using SMTPUTF8. If not, it it sent using
             //pynycode-encoded domains and plain SMTP.
             if (
@@ -4309,7 +4309,7 @@ class PHPMailer
     }
 
     /**
-     * Check whether the supplied address uses unicode in the localpart.
+     * Check whether the supplied address uses Unicode in the localpart.
      *
      * @return bool
      */
@@ -4319,7 +4319,7 @@ class PHPMailer
     }
 
     /**
-     * Check whether any of the supplied addresses use unicode in the
+     * Check whether any of the supplied addresses use Unicode in the
      * localpart.
      *
      * @return bool
diff --git a/test/PHPMailer/PHPMailerTest.php b/test/PHPMailer/PHPMailerTest.php
index e0c057bc..02a3d606 100644
--- a/test/PHPMailer/PHPMailerTest.php
+++ b/test/PHPMailer/PHPMailerTest.php
@@ -1225,7 +1225,7 @@ EOT;
         self::assertTrue($this->Mail->UseSMTPUTF8);
 
         //If using SMTPUTF8, then the To header should contain
-        //unicode@unicode, for better rendering by clients like Mac
+        //Unicode@Unicode, for better rendering by clients like Mac
         //Outlook.
         $this->Mail->addAddress('spın̈altap@spın̈altap.invalid', '');
         $this->Mail->preSend();
diff --git a/test/PHPMailer/ValidateAddressTest.php b/test/PHPMailer/ValidateAddressTest.php
index adfc7763..4155b5a6 100644
--- a/test/PHPMailer/ValidateAddressTest.php
+++ b/test/PHPMailer/ValidateAddressTest.php
@@ -438,7 +438,7 @@ final class ValidateAddressTest extends TestCase
             'first.last@phplíst.com',
         ];
 
-        return $this->arrayToNamedDataProvider($unicodeaddresses, 'Invalid unicode: ');
+        return $this->arrayToNamedDataProvider($unicodeaddresses, 'Invalid Unicode: ');
     }
 
     /**