diff --git a/src/HTML5/Parser/CharacterReference.php b/src/HTML5/Parser/CharacterReference.php
index 490b548..56a206c 100644
--- a/src/HTML5/Parser/CharacterReference.php
+++ b/src/HTML5/Parser/CharacterReference.php
@@ -48,7 +48,7 @@ public static function lookupDecimal($int)
     }
 
     /**
-     * Given a hexidecimal number, return the UTF-8 character.
+     * Given a hexadecimal number, return the UTF-8 character.
      *
      * @param $hexdec
      *
diff --git a/src/HTML5/Parser/Tokenizer.php b/src/HTML5/Parser/Tokenizer.php
index e8b4aa0..0699cf1 100644
--- a/src/HTML5/Parser/Tokenizer.php
+++ b/src/HTML5/Parser/Tokenizer.php
@@ -1127,7 +1127,7 @@ protected function decodeCharacterReference($inAttribute = false)
                 return '&';
             }
 
-            // Hexidecimal encoding.
+            // Hexadecimal encoding.
             // X[0-9a-fA-F]+;
             // x[0-9a-fA-F]+;
             if ('x' === $tok || 'X' === $tok) {