diff --git a/doc/api/stream.md b/doc/api/stream.md
index 7ff94e71f2b062..c2f5a6fe43ca68 100644
--- a/doc/api/stream.md
+++ b/doc/api/stream.md
@@ -2558,6 +2558,7 @@ class WriteStream extends Writable {
   constructor(filename) {
     super();
     this.filename = filename;
+    this.fd = null;
   }
   _construct(callback) {
     fs.open(this.filename, (err, fd) => {