diff --git a/doc/api/fs.md b/doc/api/fs.md
index 47e1dd31115f6c..6ae3b18938036a 100644
--- a/doc/api/fs.md
+++ b/doc/api/fs.md
@@ -4016,6 +4016,7 @@ to be notified of filesystem changes.
 * On SunOS systems (including Solaris and SmartOS), this uses [`event ports`][].
 * On Windows systems, this feature depends on [`ReadDirectoryChangesW`][].
 * On Aix systems, this feature depends on [`AHAFS`][], which must be enabled.
+* On IBM i systems, this feature is not supported.
 
 If the underlying functionality is not available for some reason, then
 `fs.watch()` will not be able to function and may thrown an exception.