diff --git a/src/api2/tape/restore.rs b/src/api2/tape/restore.rs
index aac1826b..2ce16c9d 100644
--- a/src/api2/tape/restore.rs
+++ b/src/api2/tape/restore.rs
@@ -36,7 +36,7 @@ use pbs_tape::{
 use proxmox_rest_server::WorkerTask;
 
 use crate::{
-    tools::ParallelHandler,
+    tools::parallel_handler::ParallelHandler,
     server::lookup_user_email,
     tape::{
         TAPE_STATUS_DIR,
diff --git a/src/backup/verify.rs b/src/backup/verify.rs
index e835d625..307d366c 100644
--- a/src/backup/verify.rs
+++ b/src/backup/verify.rs
@@ -15,7 +15,7 @@ use pbs_datastore::index::IndexFile;
 use pbs_datastore::manifest::{archive_type, ArchiveType, BackupManifest, FileInfo};
 use proxmox_sys::fs::lock_dir_noblock_shared;
 
-use crate::tools::ParallelHandler;
+use crate::tools::parallel_handler::ParallelHandler;
 
 /// A VerifyWorker encapsulates a task worker, datastore and information about which chunks have
 /// already been verified or detected as corrupt.
diff --git a/src/server/pull.rs b/src/server/pull.rs
index 8b52e8c2..a2a5f1f1 100644
--- a/src/server/pull.rs
+++ b/src/server/pull.rs
@@ -31,7 +31,7 @@ use pbs_tools::sha::sha256;
 use pbs_client::{BackupReader, BackupRepository, HttpClient, HttpClientOptions, RemoteChunkReader};
 use proxmox_rest_server::WorkerTask;
 
-use crate::tools::ParallelHandler;
+use crate::tools::parallel_handler::ParallelHandler;
 
 // fixme: implement filters
 // fixme: delete vanished groups
diff --git a/src/tools/mod.rs b/src/tools/mod.rs
index 1f123848..685eb4a2 100644
--- a/src/tools/mod.rs
+++ b/src/tools/mod.rs
@@ -22,7 +22,6 @@ pub mod systemd;
 pub mod ticket;
 
 pub mod parallel_handler;
-pub use parallel_handler::ParallelHandler;
 
 /// Shortcut for md5 sums.
 pub fn md5sum(data: &[u8]) -> Result<DigestBytes, Error> {
diff --git a/src/tools/parallel_handler.rs b/src/tools/parallel_handler.rs
index 76f761c4..b2059406 100644
--- a/src/tools/parallel_handler.rs
+++ b/src/tools/parallel_handler.rs
@@ -1,3 +1,5 @@
+//! A thread pool which run a closure in parallel.
+
 use std::sync::{Arc, Mutex};
 use std::thread::JoinHandle;