diff --git a/files.html b/files.html
index bc1b705..1227403 100644
--- a/files.html
+++ b/files.html
@@ -300,7 +300,7 @@ ValueError: I/O operation on closed file.</samp>
 
 <p class=ss><img src=examples/beauregard.jpg alt='my dog Beauregard' width=100 height=100>
 
-<p>Not every file contains text. Some of them contain pictures of my dog.
+<p>Not all files contains text. Some of them contain pictures of my dog.
 
 <pre class=screen>
 <a><samp class=p>>>> </samp><kbd class=pp>an_image = open('examples/beauregard.jpg', mode='rb')</kbd>                <span class=u>&#x2460;</span></a>