diff --git a/README.md b/README.md
index 9f63dc0..cbe763e 100644
--- a/README.md
+++ b/README.md
@@ -35,12 +35,16 @@ On Windows, run it via the command prompt (Start ‣ Accessories):
 
 Alternatively, running `odpdown` directly from the git checkout is
 also possible, provided you've installed the prerequisites (most
-significantly mistune, lpod, pygments and pillow) manually.
+significantly mistune, lpod, pygments, lxml and pillow) manually.
 
 ## Tests
 
 Run `tox` to run the test suite.
 
+    pip install tox
+    tox -v
+
+
 ## Usage
 
 	usage: odpdown [-h] [--version] [-p PAGE] [-n] [-s HIGHLIGHT_STYLE]
diff --git a/requirements.txt b/requirements.txt
index 75c88ed..6c6a633 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,3 +4,4 @@ cram>=0.6
 pygments>=1.6
 pillow>=2.0
 BeautifulSoup
+lxml>=3.4.4
diff --git a/setup.py b/setup.py
index 6722778..87d403e 100644
--- a/setup.py
+++ b/setup.py
@@ -46,6 +46,7 @@ class install(setuptools.command.install.install):
           'lpod-python>=1.1.6',
           'pygments>=1.6',
           'pillow>=2.0',
+          'lxml>=3.4.4',
       ],
       classifiers=[
           'Development Status :: 4 - Beta',
diff --git a/tox.ini b/tox.ini
index 15abc2b..840ddb9 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,7 +4,6 @@ envlist = py27,flake8
 [testenv]
 whitelist_externals = cram
 deps = -rrequirements.txt
-       lxml
        nose
 commands = nosetests
            cram cramtest
@@ -13,4 +12,4 @@ commands = nosetests
 basepython=python
 deps=flake8
 commands=
-    flake8 odpdown odpdown.py
\ No newline at end of file
+    flake8 odpdown odpdown.py