diff --git a/lib/src/filter.rs b/lib/src/filter.rs
index 59a74ae..ea808f6 100644
--- a/lib/src/filter.rs
+++ b/lib/src/filter.rs
@@ -1,3 +1,5 @@
+//! The `Filterer` trait, two implementations, and some helper functions.
+
 use std::sync::Arc;
 
 use ignore::gitignore::GitignoreBuilder;
diff --git a/lib/src/filter/tagged.rs b/lib/src/filter/tagged.rs
index 3b8a924..4d09c44 100644
--- a/lib/src/filter/tagged.rs
+++ b/lib/src/filter/tagged.rs
@@ -1,3 +1,5 @@
+//! A complex filterer that can match any event tag and supports different matching operators.
+
 use std::collections::{HashMap, HashSet};
 use std::path::PathBuf;
 use std::sync::Arc;
diff --git a/lib/src/filter/tagged/swaplock.rs b/lib/src/filter/tagged/swaplock.rs
index 5f4e056..8271449 100644
--- a/lib/src/filter/tagged/swaplock.rs
+++ b/lib/src/filter/tagged/swaplock.rs
@@ -1,3 +1,5 @@
+//! A value that is always available, but can be swapped out.
+
 use std::fmt;
 
 use tokio::sync::watch::{channel, error::SendError, Receiver, Ref, Sender};
diff --git a/lib/src/lib.rs b/lib/src/lib.rs
index 9a1f170..2a39a62 100644
--- a/lib/src/lib.rs
+++ b/lib/src/lib.rs
@@ -82,7 +82,7 @@
 
 #![doc(html_favicon_url = "https://watchexec.github.io/logo:watchexec.svg")]
 #![doc(html_logo_url = "https://watchexec.github.io/logo:watchexec.svg")]
-#![warn(clippy::unwrap_used)]
+#![warn(clippy::unwrap_used, missing_docs)]
 #![forbid(unsafe_code)]
 
 // the toolkit to make your own