diff --git a/synchronization/semaphore.md b/synchronization/semaphore.md
index 85c7109..23306ab 100644
--- a/synchronization/semaphore.md
+++ b/synchronization/semaphore.md
@@ -7,7 +7,7 @@ A semaphore is a synchronization pattern/primitive that imposes mutual exclusion
 package semaphore
 
 var (
-	ErrNoTickets      = errors.New("semaphore: could not aquire semaphore")
+	ErrNoTickets      = errors.New("semaphore: could not acquire semaphore")
 	ErrIllegalRelease = errors.New("semaphore: can't release the semaphore without acquiring it first")
 )