diff --git a/fetch.bs b/fetch.bs
index a201490c2..c30bf1321 100644
--- a/fetch.bs
+++ b/fetch.bs
@@ -1869,6 +1869,12 @@ otherwise, it is unset.
 <a for=request>done flag</a>, and <a for=request>timing allow failed flag</a> are used as
 bookkeeping details by the <a for=/>fetch</a> algorithm.
 
+<p>A <a for=/>request</a> has an associated boolean
+<dfn export for=request id=concept-request-render-blocking>render-blocking</dfn>.
+Unless stated otherwise, it is false.
+
+<p class=note>This flag is for exclusive use by HTML's render-blocking mechanism. [[!HTML]]
+
 <hr>
 
 <p>A <dfn export>subresource request</dfn> is a <a for=/>request</a>
@@ -3984,8 +3990,9 @@ the request.
 
  <li>
   <p>If <var>request</var>'s <a for=request>priority</a> is null, then use <var>request</var>'s
-  <a for=request>initiator</a> and <a for=request>destination</a> appropriately in setting
-  <var>request</var>'s <a for=request>priority</a> to a user-agent-defined object.
+  <a for=request>initiator</a>, <a for=request>destination</a> and
+  <a for=request>render-blocking</a> appropriately in setting <var>request</var>'s
+  <a for=request>priority</a> to a user-agent-defined object.
 
   <p class=note>The user-agent-defined object could encompass stream weight and dependency for
   HTTP/2, and equivalent information used to prioritize dispatch and processing of HTTP/1 fetches.