diff --git a/clippy_lints/src/utils/mod.rs b/clippy_lints/src/utils/mod.rs
index b9cde75d51d8..eebc2913d29a 100644
--- a/clippy_lints/src/utils/mod.rs
+++ b/clippy_lints/src/utils/mod.rs
@@ -130,6 +130,15 @@ pub fn match_def_path(tcx: TyCtxt<'_, '_, '_>, def_id: DefId, path: &[&str]) ->
     apb.names.len() == path.len() && apb.names.into_iter().zip(path.iter()).all(|(a, &b)| *a == *b)
 }
 
+/// Get the absolute path of `def_id` as a vector of `&str`.
+///
+/// # Examples
+/// ```rust,ignore
+/// let def_path = get_def_path(tcx, def_id);
+/// if let &["core", "option", "Option"] = &def_path[..] {
+///     // The given `def_id` is that of an `Option` type
+/// };
+/// ```
 pub fn get_def_path(tcx: TyCtxt<'_, '_, '_>, def_id: DefId) -> Vec<&'static str> {
     let mut apb = AbsolutePathBuffer { names: vec![] };
     tcx.push_item_path(&mut apb, def_id, false);