diff --git a/en_US.ISO8859-1/books/porters-handbook/book.sgml b/en_US.ISO8859-1/books/porters-handbook/book.sgml
index 118b6c1056..0d3963d83a 100644
--- a/en_US.ISO8859-1/books/porters-handbook/book.sgml
+++ b/en_US.ISO8859-1/books/porters-handbook/book.sgml
@@ -4975,7 +4975,8 @@ PLIST_SUB=      OCTAVE_VERSION=${OCTAVE_VERSION}</programlisting>
 	  along with <filename><makevar>PLIST</makevar></filename>
 	  contents.  Names listed in <makevar>PLIST_FILES</makevar>
 	  and <makevar>PLIST_DIRS</makevar> are subject to
-	  <literal>%%VAR%%</literal> substitution, as described above.
+	  <literal>%%<replaceable>VAR</replaceable>%%</literal>
+	  substitution, as described above.
 	  Except for that, names from <makevar>PLIST_FILES</makevar>
 	  will appear in the final packing list unchanged,
 	  while <literal>@dirrm</literal> will be