diff --git a/crates/ra_vfs/src/lib.rs b/crates/ra_vfs/src/lib.rs
index 7fccc30880..0e0edf2618 100644
--- a/crates/ra_vfs/src/lib.rs
+++ b/crates/ra_vfs/src/lib.rs
@@ -5,8 +5,10 @@
 //! need to get it into the memory in the first place somehow. VFS is the
 //! component which does this.
 //!
-//! It also is responsible for watching the disk for changes, and for merging
+//! It is also responsible for watching the disk for changes, and for merging
 //! editor state (modified, unsaved files) with disk state.
+//! TODO: Some LSP clients support watching the disk, so this crate should
+//! to support custom watcher events (related to https://github.com/rust-analyzer/rust-analyzer/issues/131)
 //!
 //! VFS is based on a concept of roots: a set of directories on the file system
 //! whihc are watched for changes. Typically, there will be a root for each