From 92f680889dc7eac4dc1c1c28318d0bacd4b57c87 Mon Sep 17 00:00:00 2001
From: Matthew Hodgson <matthew@matrix.org>
Date: Fri, 27 Oct 2017 00:02:22 +0100
Subject: [PATCH] spell out need for libxml2 for lxml to work

---
 README.rst | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/README.rst b/README.rst
index 9da8c7f7a..6f146b63b 100644
--- a/README.rst
+++ b/README.rst
@@ -823,7 +823,9 @@ spidering 'internal' URLs on your network.  At the very least we recommend that
 your loopback and RFC1918 IP addresses are blacklisted.
 
 This also requires the optional lxml and netaddr python dependencies to be
-installed.
+installed.  This in turn requires the libxml2 library to be available - on
+Debian/Ubuntu this means ``apt-get install libxml2-dev``, or equivalent for
+your OS.
 
 
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