diff --git a/doc/api/webstreams.md b/doc/api/webstreams.md
index 99514a58e91288..7c6ce5b49c977c 100644
--- a/doc/api/webstreams.md
+++ b/doc/api/webstreams.md
@@ -425,7 +425,8 @@ added: v16.5.0
 -->
 
 * Type: {Promise} Fulfilled with `undefined` when the associated
-  {ReadableStream} is closed or this reader's lock is released.
+  {ReadableStream} is closed or rejected if the stream errors or the reader's
+  lock is released before the stream finishes closing.
 
 #### `readableStreamDefaultReader.read()`
 
@@ -552,7 +553,8 @@ added: v16.5.0
 -->
 
 * Type: {Promise} Fulfilled with `undefined` when the associated
-  {ReadableStream} is closed or this reader's lock is released.
+  {ReadableStream} is closed or rejected if the stream errors or the reader's
+  lock is released before the stream finishes closing.
 
 #### `readableStreamBYOBReader.read(view)`