diff --git a/src/main.rs b/src/main.rs
index 4993f8b..dd35a18 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -56,7 +56,7 @@ struct Options {
     description_extract: bool,
 
     /// Extract the description of the function category from the given markdown file.
-     #[arg(long)]
+    #[arg(long)]
     description_file: Option<PathBuf>,
 
     /// Nix file to process.
@@ -370,15 +370,24 @@ fn collect_entries(root: rnix::Root, category: &str) -> Vec<ManualEntry> {
     vec![]
 }
 
-fn retrieve_description(nix: &rnix::Root, description: &str, description_extract: bool, description_file: Option<PathBuf>, category: &str) -> String {
+fn retrieve_description(
+    nix: &rnix::Root,
+    description: &str,
+    description_extract: bool,
+    description_file: Option<PathBuf>,
+    category: &str,
+) -> String {
     if description_extract {
-        dedent(&nix.syntax()
-            .first_child()
-            .and_then(|node| retrieve_doc_comment(&node, true))
-            .expect("could not read description from top-level comment"))
+        dedent(
+            &nix.syntax()
+                .first_child()
+                .and_then(|node| retrieve_doc_comment(&node, true))
+                .expect("could not read description from top-level comment"),
+        )
     } else if let Some(filename) = description_file {
-        let content = fs::read_to_string(&filename)
-            .unwrap_or_else(|e| panic!("could not read description from \"{:?}\": {}", filename, e));
+        let content = fs::read_to_string(&filename).unwrap_or_else(|e| {
+            panic!("could not read description from \"{:?}\": {}", filename, e)
+        });
         dedent(&content)
     } else {
         format!(
@@ -400,7 +409,13 @@ fn main() {
             .expect("could not read location information"),
     };
     let nix = rnix::Root::parse(&src).ok().expect("failed to parse input");
-    let description = retrieve_description(&nix, &opts.description, opts.description_extract, opts.description_file, &opts.category);
+    let description = retrieve_description(
+        &nix,
+        &opts.description,
+        opts.description_extract,
+        opts.description_file,
+        &opts.category,
+    );
 
     // TODO: move this to commonmark.rs
     writeln!(output, "{}", description).expect("Failed to write header");
@@ -446,7 +461,13 @@ fn test_description_in_external_file() {
     let src = fs::read_to_string("test/line-comments.nix").unwrap();
     let nix = rnix::Root::parse(&src).ok().expect("failed to parse input");
     let category = "line-comments";
-    let desc = retrieve_description(&nix, &"", false, Some("test/line-comments.md".into()), category);
+    let desc = retrieve_description(
+        &nix,
+        &"",
+        false,
+        Some("test/line-comments.md".into()),
+        category,
+    );
     writeln!(output, "{}", desc).expect("Failed to write header");
 
     for entry in collect_entries(nix, category) {