diff --git a/docs/building.rst b/docs/building.rst
index f5e90b1..cacd175 100644
--- a/docs/building.rst
+++ b/docs/building.rst
@@ -130,16 +130,16 @@ Debian, this can be done by installing the ``build-essential`` package.
 
 You will need the following packages (at least):
 
-* python-imaging or python-pillow
-* python-imaging-dev or python-pillow-dev
-* python-dev
-* python-numpy
+* python3-imaging or python3-pillow
+* python3-imaging-dev or python3-pillow-dev
+* python3-dev
+* python3-numpy
 
 Then to build::
 
-    python2 setup.py build
+    python3 setup.py build
     
-At this point, you can run ``./overviewer.py`` from the current directory, so to run it you'll have to be in this directory and run ``./overviewer.py`` or provide the the full path to ``overviewer.py``.  Another option would be to add this directory to your ``$PATH``.   Note that there is a ``python2 setup.py install`` step that you can run which will install things into ``/usr/local/bin``, but this is strongly not recommended as it might conflict with other installs of Overviewer.
+At this point, you can run ``./overviewer.py`` from the current directory, so to run it you'll have to be in this directory and run ``./overviewer.py`` or provide the the full path to ``overviewer.py``.  Another option would be to add this directory to your ``$PATH``.   Note that there is a ``python3 setup.py install`` step that you can run which will install things into ``/usr/local/bin``, but this is strongly not recommended as it might conflict with other installs of Overviewer.
 
 macOS
 -----