diff --git a/doc/api/stream.md b/doc/api/stream.md
index b961171a2ab28a..8096f1b6f94e7e 100644
--- a/doc/api/stream.md
+++ b/doc/api/stream.md
@@ -2482,6 +2482,7 @@ class WriteStream extends Writable {
   constructor(filename) {
     super();
     this.filename = filename;
+    this.fd = null;
   }
   _construct(callback) {
     fs.open(this.filename, (err, fd) => {