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diff --git a/doc/xmllint.xml b/doc/xmllint.xml
index e0ba0ee..8ab468f 100644
--- a/doc/xmllint.xml
+++ b/doc/xmllint.xml
@@ -104,7 +104,8 @@
<title>Introduction</title>
<para>
The xmllint program parses one or more XML files, specified on the
- command line as <replaceable>xmlfile</replaceable>. It prints various
+ command line as <replaceable>xmlfile</replaceable> (or the standard
+ input if the filename provided is - ). It prints various
types of output, depending upon the options selected. It is useful for
detecting errors both in <acronym>XML</acronym> code and in the
<acronym>XML</acronym> parser itself.