diff --git a/src/cmd/watch.rs b/src/cmd/watch.rs
index 9e8fe89a..9d9960f7 100644
--- a/src/cmd/watch.rs
+++ b/src/cmd/watch.rs
@@ -87,6 +87,8 @@ fn find_gitignore(book_root: &Path) -> Option<PathBuf> {
         .find(|p| p.exists())
 }
 
+// Using `canonicalize` can fail on Windows sometimes, might be a potential risk.
+// see ([https://github.com/rust-lang/mdBook/pull/2229#discussion_r1408665981).
 fn filter_ignored_files(ignore: Gitignore, paths: &[PathBuf]) -> Vec<PathBuf> {
     let ignore_root = ignore
         .path()