diff --git a/README.md b/README.md
index d7730c0..3e3809a 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,19 @@
 Software to reconstruct git history from tarballs.
 
 https://marc.info/?l=linux-kernel&m=139033182525831
+
+# Installing
+
+## Ubuntu 16.04
+
+The Git package in Xenial is too old, so you'll need to upgrade it.
+
+```sh
+git clone https://github.com/ali1234/gitxref.git
+cd gitxref/
+sudo python3 setup.py install
+
+sudo add-apt-repository ppa:git-core/ppa
+sudo apt-get update
+sudo apt-get install git
+```
diff --git a/setup.py b/setup.py
index 2e6e1e3..c2a4cf0 100644
--- a/setup.py
+++ b/setup.py
@@ -9,7 +9,7 @@
     author='Alistair Buxton',
     author_email='a.j.buxton@gmail.com',
     description='',
-    install_requires=['numpy', 'tqdm'],
+    install_requires=['numpy', 'tqdm', 'gitpython'],
     entry_points={
         'console_scripts': [
             'gitxref = gitxref.__main__:main'