diff --git a/src/doc/user/usermanual.sgml b/src/doc/user/usermanual.sgml
index c2b360c0..4f46ad74 100644
--- a/src/doc/user/usermanual.sgml
+++ b/src/doc/user/usermanual.sgml
@@ -2590,7 +2590,8 @@ while query.next >= 0 and query.next < nres:
PDF: pdftotext is part of the Xpdf package.
+ url="http://www.foolabs.com/xpdf/">Xpdf or Poppler packages.
Postscript: