diff --git a/src/Period.php b/src/Period.php
index e07ca4d..ac80649 100644
--- a/src/Period.php
+++ b/src/Period.php
@@ -41,7 +41,7 @@ public static function make($start, $end, string $format = null): Period
         }
 
         if ($end === null) {
-            throw InvalidDate::cannotBeNull('Endß date');
+            throw InvalidDate::cannotBeNull('End date');
         }
 
         return new static(