spell out need for libxml2 for lxml to work

1 files changed, 3 insertions, 1 deletions

diff --git a/README.rst b/README.rst

index 9da8c7f7a8..6f146b63b1 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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