diff --git a/.appveyor.yml b/.appveyor.yml
index f299794b6..09951f0f8 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -34,9 +34,15 @@ environment:
     EXECUTABLE: bin/pypy.exe
     PIP_DIR: bin
     VENV: YES
+  - PYTHON: C:\Python38rc1-x64
 
 
 install:
+- ps: |
+      if ($env:PYTHON -eq "C:\Python38rc1-x64") {
+        curl -o install_python.ps1 https://raw.githubusercontent.com/matthew-brett/multibuild/d0cf77e62028704875073e3dc4626f61d1c33b0e/install_python.ps1
+        .\install_python.ps1
+      }
 - curl -fsSL -o pillow-depends.zip https://github.com/python-pillow/pillow-depends/archive/master.zip
 - 7z x pillow-depends.zip -oc:\
 - mv c:\pillow-depends-master c:\pillow-depends
diff --git a/.github/workflows/test-docker.yml b/.github/workflows/test-docker.yml
new file mode 100644
index 000000000..09beb2fdd
--- /dev/null
+++ b/.github/workflows/test-docker.yml
@@ -0,0 +1,40 @@
+name: Test Docker
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        docker: [
+          alpine,
+          arch,
+          ubuntu-16.04-xenial-amd64,
+          ubuntu-18.04-bionic-amd64,
+          debian-9-stretch-x86,
+          debian-10-buster-x86,
+          centos-6-amd64,
+          centos-7-amd64,
+          amazon-1-amd64,
+          amazon-2-amd64,
+          fedora-29-amd64,
+          fedora-30-amd64,
+        ]
+        dockerTag: [master]
+
+    name: ${{ matrix.docker }}
+
+    steps:
+    - uses: actions/checkout@v1
+
+    - name: Docker pull
+      run: |
+        docker pull pythonpillow/${{ matrix.docker }}:${{ matrix.dockerTag }}
+
+    - name: Docker build
+      run: |
+        # The Pillow user in the docker container is UID 1000
+        sudo chown -R 1000 $GITHUB_WORKSPACE
+        docker run -v $GITHUB_WORKSPACE:/Pillow pythonpillow/${{ matrix.docker }}:${{ matrix.dockerTag }}
diff --git a/README.rst b/README.rst
index 6b783a95a..e35091bae 100644
--- a/README.rst
+++ b/README.rst
@@ -14,7 +14,7 @@ Pillow is the friendly PIL fork by `Alex Clark and Contributors <https://github.
     * - docs
       - |docs|
     * - tests
-      - |linux| |macos| |windows| |coverage|
+      - |linux| |macos| |windows| |gha_lint| |gha_docker| |coverage|
     * - package
       - |zenodo| |tidelift| |version| |downloads|
     * - social
@@ -60,6 +60,12 @@ To report a security vulnerability, please follow the procedure described in the
    :target: https://ci.appveyor.com/project/python-pillow/Pillow
    :alt: AppVeyor CI build status (Windows)
 
+.. |gha_lint| image:: https://github.com/python-pillow/Pillow/workflows/Lint/badge.svg
+   :alt: GitHub Actions build status (Lint)
+
+.. |gha_docker| image:: https://github.com/python-pillow/Pillow/workflows/Test%20Docker/badge.svg
+   :alt: GitHub Actions build status (Test Docker)
+
 .. |coverage| image:: https://codecov.io/gh/python-pillow/Pillow/branch/master/graph/badge.svg
    :target: https://codecov.io/gh/python-pillow/Pillow
    :alt: Code coverage
diff --git a/docs/handbook/concepts.rst b/docs/handbook/concepts.rst
index 582866345..7e782e743 100644
--- a/docs/handbook/concepts.rst
+++ b/docs/handbook/concepts.rst
@@ -104,6 +104,15 @@ the file format handler (see the chapter on :ref:`image-file-formats`). Most
 handlers add properties to the :py:attr:`~PIL.Image.Image.info` attribute when
 loading an image, but ignore it when saving images.
 
+Orientation
+-----------
+
+A common element of the :py:attr:`~PIL.Image.Image.info` attribute for JPG and
+TIFF images is the EXIF orientation tag. This is an instruction for how the
+image data should be oriented. For example, it may instruct an image to be
+rotated by 90 degrees, or to be mirrored. To apply this information to an
+image, :py:meth:`~PIL.ImageOps.exif_transpose` can be used.
+
 .. _concept-filters:
 
 Filters
diff --git a/winbuild/config.py b/winbuild/config.py
index 38532a62e..37e45e8cb 100644
--- a/winbuild/config.py
+++ b/winbuild/config.py
@@ -11,6 +11,7 @@ pythons = {
     "36": {"compiler": 7.1, "vc": 2015},
     "pypy3": {"compiler": 7.1, "vc": 2015},
     "37": {"compiler": 7.1, "vc": 2015},
+    "38rc1-x64": {"compiler": 7.1, "vc": 2015},
     # for GitHub Actions
     "3.5": {"compiler": 7.1, "vc": 2015},
     "3.6": {"compiler": 7.1, "vc": 2015},