diff --git a/Cargo.toml b/Cargo.toml
index ca7cdad..894ed21 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,5 +13,6 @@ Support for matching file paths against Unix shell style patterns.
 categories = ["filesystem"]
 
 [dev-dependencies]
+# FIXME: Replace it with `tempfile` once we bump up MSRV.
 tempdir = "0.3"
 doc-comment = "0.3"