diff --git a/README.md b/README.md
index fee1720..68b7fa9 100644
--- a/README.md
+++ b/README.md
@@ -1690,7 +1690,7 @@ CompletedProcess(args='bc', returncode=0, stdout='2\n', stderr='')
 >>> os.popen('echo 1 + 1 > test.in')
 >>> run(split('bc -s'), stdin=open('test.in'), stdout=open('test.out', 'w'))
 CompletedProcess(args=['bc', '-s'], returncode=0)
->>> os.popen('cat test.out').read()
+>>> open('test.out').read()
 '2\n'
 ```
 
diff --git a/index.html b/index.html
index 7ef0cea..50bfd83 100644
--- a/index.html
+++ b/index.html
@@ -1531,7 +1531,7 @@ CompletedProcess(args=<span class="hljs-string">'bc'</span>, returncode=<span cl
 <span class="hljs-meta">&gt;&gt;&gt; </span>os.popen(<span class="hljs-string">'echo 1 + 1 &gt; test.in'</span>)
 <span class="hljs-meta">&gt;&gt;&gt; </span>run(split(<span class="hljs-string">'bc -s'</span>), stdin=open(<span class="hljs-string">'test.in'</span>), stdout=open(<span class="hljs-string">'test.out'</span>, <span class="hljs-string">'w'</span>))
 CompletedProcess(args=[<span class="hljs-string">'bc'</span>, <span class="hljs-string">'-s'</span>], returncode=<span class="hljs-number">0</span>)
-<span class="hljs-meta">&gt;&gt;&gt; </span>os.popen(<span class="hljs-string">'cat test.out'</span>).read()
+<span class="hljs-meta">&gt;&gt;&gt; </span>open(<span class="hljs-string">'test.out'</span>).read()
 <span class="hljs-string">'2\n'</span>
 </code></pre></div>