diff --git a/doc/go1.1.html b/doc/go1.1.html
index 71517fc2d8..46174aad10 100644
--- a/doc/go1.1.html
+++ b/doc/go1.1.html
@@ -832,6 +832,8 @@ reads progressive JPEG files and handles a few more subsampling configurations.
 The <a href="/pkg/io/"><code>io</code></a> package now exports the
 <a href="/pkg/io/#ByteWriter"><code>io.ByteWriter</code></a> interface to capture the common
 functionality of writing a byte at a time.
+It also exports a new error, <a href="/pkg/io/#ErrNoProgress"><code>ErrNoProgress</code></a>,
+used to indicate a <code>Read</code> implementation is looping without delivering data.
 </li>
 
 <li>