1 files changed, 2 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index 9c6776e59..e830bc744 100644
--- a/Makefile
+++ b/Makefile
@@ -115,6 +115,8 @@ all::
 #
 # Define ASCIIDOC8 if you want to format documentation with AsciiDoc 8
 #
+# Define DOCBOOK_XSL_172 if you want to format man pages with DocBook XSL v1.72.
+#
 # Define NO_PERL_MAKEMAKER if you cannot use Makefiles generated by perl's
 # MakeMaker (e.g. using ActiveState under Cygwin).
 #