diff --git a/crates/ra_assists/src/test_db.rs b/crates/ra_assists/src/test_db.rs
index 7b196561ab..5be7383edc 100644
--- a/crates/ra_assists/src/test_db.rs
+++ b/crates/ra_assists/src/test_db.rs
@@ -1,3 +1,5 @@
+//! Database used for testing `ra_assists`.
+
 use std::sync::Arc;
 
 use ra_db::{salsa, CrateId, FileId, FileLoader, FileLoaderDelegate, RelativePath};
diff --git a/crates/ra_hir/src/test_db.rs b/crates/ra_hir/src/test_db.rs
index 84a2bf02b9..5237b303af 100644
--- a/crates/ra_hir/src/test_db.rs
+++ b/crates/ra_hir/src/test_db.rs
@@ -1,4 +1,4 @@
-//! FIXME: write short doc here
+//! Database used for testing `hir`.
 
 use std::{panic, sync::Arc};