diff --git a/winfsnotify/go.mod b/winfsnotify/go.mod
new file mode 100644
index 0000000..248af1a
--- /dev/null
+++ b/winfsnotify/go.mod
@@ -0,0 +1,3 @@
+module golang.org/x/exp/winfsnotify
+
+go 1.11
diff --git a/winfsnotify/winfsnotify.go b/winfsnotify/winfsnotify.go
index 8c7c43f..e25ecfa 100644
--- a/winfsnotify/winfsnotify.go
+++ b/winfsnotify/winfsnotify.go
@@ -7,6 +7,11 @@
 
 // Package winfsnotify allows the user to receive
 // file system event notifications on Windows.
+//
+// Deprecated: winfsnotify has been unmaintained since 2016 (see
+// https://go.dev/issue/51447). Forks of this package with more recent
+// maintenance and cross-platform support can be found at
+// https://pkg.go.dev/search?q=fsnotify.
 package winfsnotify // import "golang.org/x/exp/winfsnotify"
 
 import (