Document the need for a docbook-xsl bundle in order to build the docs.

diff --git a/INSTALL b/INSTALL
index 787b5e3892bafe6d13ea4b17b47d9558f515d46f..e74e113b814cd64d7f9b3feff8727e8742b194e9 100644 (file)
--- a/INSTALL
+++ b/INSTALL
@@ -41,7 +41,11 @@ systems:
 
        http://www.gnu.org/software/libiconv/
 
+- For building the manual, mutt needs the DocBook XSL stylesheets.
+  You may find these packaged by your distribution (for example, docbook-xsl
+  for Debian and Ubuntu); if not, try the homepage at:
 
+    http://sourceforge.net/projects/docbook
 
 Installation
 ============