diff --git a/types/generic-pool/generic-pool-tests.ts b/types/generic-pool/generic-pool-tests.ts
index 09a1e611ea..4b8a69aa93 100644
--- a/types/generic-pool/generic-pool-tests.ts
+++ b/types/generic-pool/generic-pool-tests.ts
@@ -48,6 +48,7 @@ pool.use((conn: Connection) => 'test')
 
 pool.acquire()
     .then((conn: Connection) => {
+        console.log(pool.isBorrowedResource(conn));  // => true
         return pool.release(conn);
     }).then(() => {
         return pool.acquire(5);
diff --git a/types/generic-pool/index.d.ts b/types/generic-pool/index.d.ts
index e50682ab12..7a446243db 100644
--- a/types/generic-pool/index.d.ts
+++ b/types/generic-pool/index.d.ts
@@ -24,6 +24,7 @@ export class Pool<T> extends EventEmitter {
     drain(): PromiseLike<void>;
     clear(): PromiseLike<void>;
     use<U>(cb: (resource: T) => U): PromiseLike<U>;
+    isBorrowedResource(resource: T): boolean;
 }
 
 export interface Factory<T> {