diff --git a/types/semaphore/index.d.ts b/types/semaphore/index.d.ts
index 5733785782..3164f95d9e 100644
--- a/types/semaphore/index.d.ts
+++ b/types/semaphore/index.d.ts
@@ -1,10 +1,9 @@
-// Type definitions for semaphore v1.0.3
+// Type definitions for semaphore v1.1.0
 // Project: https://github.com/abrkn/semaphore.js
 // Definitions by: Matt Frantz <https://github.com/mhfrantz>
+//                 Arturas Molcanovas <https://github.com/Alorel>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-
-
 declare function semaphore(capacity?: number): semaphore.Semaphore;
 
 declare namespace semaphore {
@@ -16,6 +15,8 @@ declare namespace semaphore {
     interface Semaphore {
         capacity: number;
 
+        available(n: number): boolean;
+
         take(task: Task): void;
         take(n: number, task: Task): void;
 
diff --git a/types/semaphore/semaphore-tests.ts b/types/semaphore/semaphore-tests.ts
index c3d53990fc..5770a9ba15 100644
--- a/types/semaphore/semaphore-tests.ts
+++ b/types/semaphore/semaphore-tests.ts
@@ -10,3 +10,5 @@ function task() {
 sem.take(task);
 sem.take(2, task);
 sem.leave(2);
+
+const available: boolean = sem.available(2);