dpkg-parsechangelog(1): Document that -l- can be used to read from stdin

debian/changelog

@@ -106,6 +106,7 @@ dpkg (1.17.0) UNRELEASED; urgency=low
   * Require at least one filename on dpkg-name after --.
   * Switch program usage errors to not print entire --help output.
     Closes: #681371
+  * Document that «dpkg-parsechangelog -l-» can be used to read from stdin.
 
   [ Updated programs translations ]
   * Fix typo in Spanish translation of update-alternatives.

man/dpkg-parsechangelog.1

@@ -36,7 +36,8 @@ form.
 .SH OPTIONS
 .TP
 .BI \-l changelog-file
-Specifies the changelog file to read information from. The
+Specifies the changelog file to read information from. A '\-' can be
+used to specify reading from standard input. The
 default is
 .BR debian/changelog .
 .TP