diff --git a/src/tools/loopdev.rs b/src/tools/loopdev.rs
index 9f1d6fd1..68918dfd 100644
--- a/src/tools/loopdev.rs
+++ b/src/tools/loopdev.rs
@@ -1,3 +1,5 @@
+//! Helpers to work with /dev/loop* devices
+
 use anyhow::Error;
 use std::fs::{File, OpenOptions};
 use std::path::Path;