diff --git a/src/pattern.js b/src/pattern.js
index 0c3e1c9..1dae919 100644
--- a/src/pattern.js
+++ b/src/pattern.js
@@ -70,7 +70,7 @@ CronPattern.prototype.parse = function () {
 
 	// Validite number of configuration entries
 	if( parts.length < 5 || parts.length > 6 ) {
-		throw new TypeError("CronPattern: invalid configuration format ('" + this.pattern + "'), exacly five or six space separated parts required.");
+		throw new TypeError("CronPattern: invalid configuration format ('" + this.pattern + "'), exactly five or six space separated parts are required.");
 	}
 
 	// If seconds is omitted, insert 0 for seconds
@@ -467,4 +467,4 @@ CronPattern.prototype.setNthWeekdayOfMonth = function(index, nthWeekday) {
 	}
 };
 
-export { CronPattern };
\ No newline at end of file
+export { CronPattern };