diff --git a/doc/cmdtest.html b/doc/cmdtest.html
index 760829d..9794b8a 100644
--- a/doc/cmdtest.html
+++ b/doc/cmdtest.html
@@ -3,7 +3,7 @@
 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
-<meta name="generator" content="Docutils 0.12: http://docutils.sourceforge.net/" />
+<meta name="generator" content="Docutils 0.14: http://docutils.sourceforge.net/" />
 <title>Cmdtest User Guide</title>
 <style type="text/css">
 
@@ -870,6 +870,20 @@ in recent versions of JUnit).</dd>
 <dd>&quot;touch&quot; a file inside the &quot;work directory&quot;.
 The filename is evaluated relative to the current directory at the
 time of the call.</dd>
+<dt><tt class="docutils literal">stdout_check()</tt></dt>
+<dd><p class="first">Will &quot;callback&quot; to the test script, giving the user a chance to inpect STDOUT,
+and maybe call &quot;assert&quot;. Example:</p>
+<pre class="last literal-block">
+cmd &quot;seq 0 5 100&quot; do
+  stdout_check do |lines|
+    assert lines.include?(55), &quot;no line '55'&quot;
+  end
+end
+</pre>
+</dd>
+<dt><tt class="docutils literal">stdout_check()</tt></dt>
+<dd>Will &quot;callback&quot; to the test script, giving the user a chance to inpect STDERR,
+and maybe call &quot;assert&quot; (see <tt class="docutils literal">stdout_check()</tt> above).</dd>
 </dl>
 </div>
 <div class="section" id="deprecated-helper-functions">
@@ -898,7 +912,7 @@ time of the call.</dd>
 <div class="footer">
 <hr class="footer" />
 <a class="reference external" href="cmdtest.txt">View document source</a>.
-Generated on: 2016-11-08.
+Generated on: 2018-04-12.
 Generated by <a class="reference external" href="http://docutils.sourceforge.net/">Docutils</a> from <a class="reference external" href="http://docutils.sourceforge.net/rst.html">reStructuredText</a> source.
 
 </div>
diff --git a/doc/cmdtest.txt b/doc/cmdtest.txt
index e2d6ae1..ef631a5 100644
--- a/doc/cmdtest.txt
+++ b/doc/cmdtest.txt
@@ -611,6 +611,20 @@ or in the ``setup`` method.
     The filename is evaluated relative to the current directory at the
     time of the call.
 
+``stdout_check()``
+    Will "callback" to the test script, giving the user a chance to inpect STDOUT,
+    and maybe call "assert". Example::
+
+      cmd "seq 0 5 100" do
+        stdout_check do |lines|
+          assert lines.include?(55), "no line '55'"
+        end
+      end
+
+``stdout_check()``
+    Will "callback" to the test script, giving the user a chance to inpect STDERR,
+    and maybe call "assert" (see ``stdout_check()`` above).
+
 Deprecated helper functions
 +++++++++++++++++++++++++++
 
