1 files changed, 2 insertions, 0 deletions

diff --git a/crates/ra_hir_expand/src/lib.rs b/crates/ra_hir_expand/src/lib.rs
index 437d73e94..6c2cc3af3 100644
--- a/crates/ra_hir_expand/src/lib.rs
+++ b/crates/ra_hir_expand/src/lib.rs
@@ -226,6 +226,8 @@ impl<N: AstNode> AstId<N> {
 #[derive(Debug, PartialEq, Eq, Clone, Copy, Hash)]
 pub struct Source<T> {
     pub file_id: HirFileId,
+    // FIXME: this stores all kind of things, not only `ast`.
+    // There should be a better name...
     pub ast: T,
 }