diff --git a/.travis.yml b/.travis.yml
index faa99fdc..c6ce2b7b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,8 +11,9 @@ cache:
         - tests/cache
 
 python:
-    - 3.4
-    - 3.5
+    - "3.4"
+    - "3.5"
+    - "3.6-dev"  # 3.6 not available yet
 
 before_cache:
     - rm -f $HOME/.cache/pip/log/debug.log
diff --git a/RELEASE_NOTES.rst b/RELEASE_NOTES.rst
index 46f29cf1..7545e4bf 100644
--- a/RELEASE_NOTES.rst
+++ b/RELEASE_NOTES.rst
@@ -3,6 +3,12 @@ RELEASE NOTES
 
 OCRmyPDF uses `semantic versioning <http://semver.org/>`_.
 
+v4.3.5:
+=======
+
+-  Update documentation to confirm Python 3.6.0 compatibility. No code changes were needed, so many earlier versions are likely supported.
+
+
 v4.3.4:
 =======
 
diff --git a/dev_requirements.txt b/dev_requirements.txt
index e8f36a71..f40c6a1b 100644
--- a/dev_requirements.txt
+++ b/dev_requirements.txt
@@ -1,6 +1,10 @@
-check-manifest >= 0.33
+check-manifest >= 0.34
 twine >= 1.8.1
-coverage >= 4.2
+coverage >= 4.3.1
+pytest-xdist >= 1.15.0
 GitPython == 2.1.0
-setuptools-scm >= 1.11.1, != 1.13.1
-setuptools_scm_git_archive == 1.0
+
+# Known good versions: 1.11.1
+# Known broken versions: 1.15.0
+setuptools-scm == 1.11.1
+setuptools-scm-git-archive == 1.0
diff --git a/docs/installation.rst b/docs/installation.rst
index cdd7da33..224c2262 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -78,6 +78,8 @@ In this worked example, the current working directory contains an input file cal
 
    docker run --rm -v "$(pwd):/home/docker"   ocrmypdf --skip-text test.pdf output.pdf
 
+.. note:: The working directory should be a writable local volume or Docker may not have permission to access it.
+
 Note that ``ocrmypdf`` has its own separate ``-v VERBOSITYLEVEL`` argument to control debug verbosity. All Docker arguments should before the ``ocrmypdf`` image name and all arguments to ``ocrmypdf`` should be listed after.
 
 
@@ -105,6 +107,8 @@ Install or upgrade the required Homebrew packages, if any are missing:
    brew install libxml2 libffi leptonica
    brew install unpaper   # optional
    
+Python 3.4, 3.5 and 3.6 are supported.
+
 Install the required Tesseract OCR engine with the language packs you plan to use:
    
 .. code-block:: bash
@@ -136,6 +140,44 @@ The command line program should now be available:
 
    ocrmypdf --help
 
+
+Installing on Ubuntu 16.04 LTS
+------------------------------
+
+No package is currently available for Ubuntu 16.04, but you can install the dependencies manually:
+
+.. code-block:: bash
+
+   sudo apt-get update
+   sudo apt-get install \
+      unpaper \
+      ghostscript \
+      tesseract-ocr \
+      qpdf \
+      python3-pip \
+      python3-pil \
+      python3-pytest \
+      python3-reportlab \
+      python3-ruffus \
+      python3-cffi
+
+If you wish install OCRmyPDF to the system Python, then install as follows (note this installs new packages
+into your system Python, which could interfere with other programs):
+
+.. code-block:: bash
+
+   sudo pip3 install ocrmypdf
+
+If you wish to install OCRmyPDF to a virtual environment to isolate the system Python, you can
+follow these steps.
+
+.. code-block:: bash
+
+   python3 -m venv --system-site-packages venv-ocrmypdf
+   source venv-ocrmypdf/bin/activate
+   pip3 install ocrmypdf
+
+
 Installing on Ubuntu 14.04 LTS
 ------------------------------
 
@@ -153,7 +195,6 @@ Update apt-get:
 .. code-block:: bash
 
    sudo apt-get update
-   sudo apt-get upgrade
    
 Install system dependencies:
 
diff --git a/requirements.txt b/requirements.txt
index 9c71d42b..a19ba791 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,4 +6,4 @@ Pillow == 3.4.2
 reportlab == 3.3.0
 PyPDF2 == 1.26
 img2pdf == 0.2.1
-cffi == 1.9.1
\ No newline at end of file
+cffi == 1.9.1
diff --git a/setup.py b/setup.py
index 9f529c06..a1d98980 100644
--- a/setup.py
+++ b/setup.py
@@ -196,6 +196,9 @@ setup(
     keywords=['PDF', 'OCR', 'optical character recognition', 'PDF/A', 'scanning'],
     classifiers=[
         "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.4",
+        "Programming Language :: Python :: 3.5",
+        "Programming Language :: Python :: 3.6",
         "Development Status :: 5 - Production/Stable",
         "Environment :: Console",
         "Intended Audience :: End Users/Desktop",
diff --git a/test_requirements.txt b/test_requirements.txt
index 7a13b208..11dafdd5 100644
--- a/test_requirements.txt
+++ b/test_requirements.txt
@@ -1 +1 @@
-pytest>=2.7.2
+pytest >= 2.7.2