diff --git a/src/Redis.php b/src/Redis.php
index 7119307..e6aa651 100644
--- a/src/Redis.php
+++ b/src/Redis.php
@@ -102,6 +102,33 @@ public function getOptions(): RedisOptions
         return $this->options;
     }
 
+    /**
+     * @psalm-api
+     * @return non-empty-string|null
+     */
+    public function getPersistentId(bool $update = false): ?string
+    {
+        $options = $this->getOptions();
+
+        if (! $options->isPersistent()) {
+            return null;
+        }
+
+        if ($update === false) {
+            $persistentId = $options->getPersistentId();
+            if ($persistentId !== null) {
+                return $persistentId;
+            }
+        }
+
+        $persistentId = $this->getRedisResource()->getPersistentID();
+        if (! is_string($persistentId) || $persistentId === '') {
+            return null;
+        }
+
+        return $persistentId;
+    }
+
     /**
      * {@inheritDoc}
      */
diff --git a/src/RedisOptions.php b/src/RedisOptions.php
index fd03019..db99951 100644
--- a/src/RedisOptions.php
+++ b/src/RedisOptions.php
@@ -74,6 +74,7 @@ final class RedisOptions extends AdapterOptions
      * The namespace separator
      */
     protected string $namespaceSeparator = ':';
+    /** @var non-empty-string|null */
     protected string|null $persistentId;
 
     protected string $redisVersion = '';
@@ -128,6 +129,9 @@ public function getNamespaceSeparator(): string
         return $this->namespaceSeparator;
     }
 
+    /**
+     * @return non-empty-string|null
+     */
     public function getPersistentId(): string|null
     {
         return $this->persistentId;