Added comment about hardware platforms.

Author: cjrh

source/deployment.rst

@@ -32,6 +32,28 @@ Supporting multiple Python versions
     in the binary extensions topic (once that exists)
   - mention version classifiers for distribution metadata
 
+
+Supporting multiple hardware platforms
+======================================
+
+::
+
+  FIXME
+
+  Meaning: x86, x64, ARM, others?
+
+  For Python-only packages, it *should* be straightforward to deploy on all
+  platforms where Python can run.
+
+  For packages with binary extensions, deployment is major headache.  Not only
+  must the extensions be built on all the combinations of operating system and
+  hardware platform, but they must also be tested, preferably on continuous
+  integration platforms.  The issues are similar to the "multiple python
+  versions" section above, not sure whether this should be a separate section.
+  Even on Windows x64, both the 32 bit and 64 bit versions of Python enjoy
+  significant usage.
+
+
 .. _`Single sourcing the version`:
 
 Single-sourcing the version across ``setup.py`` and your project