diff --git a/README.md b/README.md
index 1ed356c..770fbc0 100644
--- a/README.md
+++ b/README.md
@@ -55,6 +55,9 @@ $id = $lock->lock('pdf:create', ttl: new \DateInterval('PT10S'));
 $id = $lock->lock('pdf:create', wait: 5);
 // or
 $id = $lock->lock('pdf:create', wait: new \DateInterval('PT5S'));
+
+// Acquire lock with id - 14e1b600-9e97-11d8-9f32-f2801f1b9fd1
+$id = $lock->lock('pdf:create', id: '14e1b600-9e97-11d8-9f32-f2801f1b9fd1');
 ```
 
 ### Acquire read lock
@@ -72,6 +75,9 @@ $id = $lock->lockRead('pdf:create', ttl: new \DateInterval('PT10S'));
 $id = $lock->lockRead('pdf:create', wait: 5);
 // or
 $id = $lock->lockRead('pdf:create', wait: new \DateInterval('PT5S'));
+
+// Acquire lock with id - 14e1b600-9e97-11d8-9f32-f2801f1b9fd1
+$id = $lock->lockRead('pdf:create', id: '14e1b600-9e97-11d8-9f32-f2801f1b9fd1');
 ```
 
 ### Release lock
diff --git a/src/Lock.php b/src/Lock.php
index 6a6becd..a5fb112 100644
--- a/src/Lock.php
+++ b/src/Lock.php
@@ -29,18 +29,20 @@ public function __construct(
      * other processes that attempt to lock the same resource will be blocked until the lock is released.
      *
      * @param non-empty-string $resource The name of the resource to be locked.
+     * @param non-empty-string|null $id The lock ID. If not specified, a random UUID will be generated.
      * @param int|DateInterval $ttl The time-to-live of the lock, in seconds. Defaults to 0 (forever).
      * @param int|DateInterval $waitTTL How long to wait to acquire lock until returning false.
      * @return false|non-empty-string Returns lock ID if the lock was acquired successfully, false otherwise.
      */
     public function lock(
         string $resource,
+        ?string $id = null,
         int|DateInterval $ttl = 0,
         int|DateInterval $waitTTL = 0,
     ): false|string {
         $request = new Request();
         $request->setResource($resource);
-        $request->setId($id = $this->identityGenerator->generate());
+        $request->setId($id ??= $this->identityGenerator->generate());
         $request->setTtl($this->convertTimeToSeconds($ttl));
         $request->setWait($this->convertTimeToSeconds($waitTTL));
 
@@ -57,18 +59,20 @@ public function lock(
      * will be blocked until all shared locks are released.
      *
      * @param non-empty-string $resource The name of the resource to be locked.
+     * @param non-empty-string|null $id The lock ID. If not specified, a random UUID will be generated.
      * @param int|DateInterval $ttl The time-to-live of the lock, in seconds. Defaults to 0 (forever).
      * @param int|DateInterval $waitTTL How long to wait to acquire lock until returning false.
      * @return false|non-empty-string Returns lock ID if the lock was acquired successfully, false otherwise.
      */
     public function lockRead(
         string $resource,
+        ?string $id = null,
         int|DateInterval $ttl = 0,
         int|DateInterval $waitTTL = 0,
     ): false|string {
         $request = new Request();
         $request->setResource($resource);
-        $request->setId($id = $this->identityGenerator->generate());
+        $request->setId($id ??= $this->identityGenerator->generate());
         $request->setTtl($this->convertTimeToSeconds($ttl));
         $request->setWait($this->convertTimeToSeconds($waitTTL));
 
diff --git a/tests/src/LockTest.php b/tests/src/LockTest.php
index 6fbc88e..22d7541 100644
--- a/tests/src/LockTest.php
+++ b/tests/src/LockTest.php
@@ -45,28 +45,33 @@ public function testLock(
         int|\DateInterval|\DateTimeInterface $wait,
         int $expectedWaitSec,
         bool $expectedResult = true,
+        ?string $id = null,
     ): void {
-        $this->idGenerator->shouldReceive('generate')->once()->andReturn('some-id');
+        if ($id === null) {
+            $this->idGenerator->shouldReceive('generate')->once()->andReturn('some-id');
+        }
 
         $this->rpc->shouldReceive('call')
             ->withArgs(function (string $method, Request $request, string $response) use (
                 $expectedTtlSec,
                 $expectedWaitSec,
-                $callMethod
+                $callMethod,
+                $id
             ): bool {
                 return $method === $callMethod
                     && $request->getResource() === 'resource'
-                    && $request->getId() === 'some-id'
+                    && $request->getId() === ($id === null ? 'some-id' : $id)
                     && $request->getTtl() === $expectedTtlSec
-                    && $request->getWait() === $expectedWaitSec
-                    && $response === Response::class;
+                && $request->getWait() === $expectedWaitSec
+                && $response === Response::class;
             })
             ->andReturn(new Response(['ok' => $expectedResult]));
 
+        $result = $this->lock->$method(resource: 'resource', id: $id, ttl: $ttl, waitTTL: $wait);
         if ($expectedResult) {
-            $this->assertSame('some-id', $this->lock->$method('resource', $ttl, $wait));
+            $this->assertSame(($id === null ? 'some-id' : $id), $result);
         } else {
-            $this->assertFalse($this->lock->$method('resource', $ttl, $wait));
+            $this->assertFalse($result);
         }
     }
 
@@ -131,7 +136,7 @@ public function testUpdateTTL($ttl, int $expectedTtl, bool $result): void
     {
         $this->rpc->shouldReceive('call')
             ->once()
-            ->withArgs(function (string $method, Request $request, string $response) use($expectedTtl): bool {
+            ->withArgs(function (string $method, Request $request, string $response) use ($expectedTtl): bool {
                 return $method === 'lock.UpdateTTL'
                     && $request->getResource() === 'resource'
                     && $request->getId() === 'some-id'
@@ -165,13 +170,23 @@ public function lockTypeDataProvider(): \Generator
     {
         foreach ($this->lockDataProvider() as $name => $data) {
             foreach ([true, false] as $result) {
-                yield 'lock: ' . $name . ' | ' . \var_export($result, true) => ['lock', 'lock.Lock', ...$data, $result];
-                yield 'read-lock: ' . $name . ' | ' . \var_export($result, true) => [
-                    'lockRead',
-                    'lock.LockRead',
-                    ...$data,
-                    $result,
-                ];
+                foreach (['id1', null] as $id) {
+                    yield 'lock: ' . $name . ' | ' .$id. ' | ' . \var_export($result, true) => [
+                        'lock',
+                        'lock.Lock',
+                        ...$data,
+                        $result,
+                        $id
+                    ];
+
+                    yield 'read-lock: ' . $name . ' | ' .$id. ' | ' . \var_export($result, true) => [
+                        'lockRead',
+                        'lock.LockRead',
+                        ...$data,
+                        $result,
+                        $id
+                    ];
+                }
             }
         }
     }