doc: document 'error' event for stream.Writable

fix #5255

diff --git a/doc/api/stream.markdown b/doc/api/stream.markdown
index d750dbf..5ea3e3d 100644 (file)
--- a/doc/api/stream.markdown
+++ b/doc/api/stream.markdown
@@ -577,6 +577,10 @@ reader.pipe(writer);
 reader.unpipe(writer);
 ```
 
+#### Event: 'error'
+
+Emitted if there was an error when writing or piping data.
+
 ### Class: stream.Duplex
 
 Duplex streams are streams that implement both the [Readable][] and