diff --git a/fetch.bs b/fetch.bs
index b52320a24..91cd0efaa 100644
--- a/fetch.bs
+++ b/fetch.bs
@@ -160,8 +160,8 @@ lt="authentication entry">authentication entries</a> (for HTTP authentication).
 
 <hr>
 
-<p>A <dfn>fetch params</dfn> is a <a for=/>struct</a> used in <a for=/>fetching</a>. It has the
-following <a for=struct>items</a>:
+<p>A <dfn>fetch params</dfn> is a <a for=/>struct</a> used as a bookkeeping detail by the
+<a for=/>fetch</a> algorithm. It has the following <a for=struct>items</a>:
 
 <dl>
  <dt><dfn for="fetch params">request</dfn>
@@ -1732,11 +1732,12 @@ is to return the result of <a>serializing a request origin</a> with <var>request
 
         <p class=note>This step blocks until <var>bs</var> is fully transmitted.
 
-       <li><p>Let <var>algorithm</var> be this step: perform the <a>transmit-request-body loop</a>
-       given <var>fetchParams</var>, <var>body</var>, and <var>reader</var>.
+       <li><p>Let <var>continueAlgorithm</var> be this step: perform the
+       <a>transmit-request-body loop</a> given <var>fetchParams</var>, <var>body</var>, and
+       <var>reader</var>.
 
        <li><p>If the ongoing fetch is not <a for=fetch>terminated</a>, then
-       <a>queue a fetch task</a> given <var>algorithm</var>, <var>fetchParams</var>'s
+       <a>queue a fetch task</a> given <var>continueAlgorithm</var>, <var>fetchParams</var>'s
        <a for="fetch params">global</a>, and <var>fetchParams</var>'s
        <a for="fetch params">algorithm queue</a>.
       </ol>
@@ -3257,7 +3258,9 @@ an optional algorithm <dfn export for=fetch id=process-response><var>processResp
 optional algorithm
 <dfn export for=fetch id=process-response-end-of-body oldids=process-response-end-of-file><var>processResponseEndOfBody</var></dfn>,
 and an optional boolean <dfn export for=fetch><var>useParallelQueue</var></dfn> (default false), run
-the steps below.
+the steps below. If given, <var>processRequestBody</var> and <var>processRequestEndOfBody</var> must
+be an algorithm accepting a <a for=/>request</a>; <var>processResponse</var> and
+<var>processResponseEndOfBody</var> must be an algorithm accepting a <a for=/>response</a>.
 
 <p>An ongoing <a for=/>fetch</a> can be
 <dfn export for=fetch id=concept-fetch-terminate>terminated</dfn> with flag <var>aborted</var>,