DOC: clarify time windows for support

tacaswell · tacaswell · commit c816b09f39c1 · 2018-10-12T17:10:36.000-04:00
diff --git a/doc/devel/min_dep_policy.rst b/doc/devel/min_dep_policy.rst
@@ -13,27 +13,28 @@ is a 'minor version'.
 Python and numpy
 ================
 
-- support minor versions of ``Python`` initially released in the previous
-  3 years
-- support minor versions of ``numpy`` initially released in the
-  previous 3 years or oldest that supports the minimum python version
-  (which ever is higher)
+- support minor versions of ``Python`` initially released
+  36 months prior to our planned release date.
+- support minor versions of ``numpy`` initially released in the 36
+  months prior to our planned release date or oldest that supports the
+  minimum python version (which ever is higher)
 
 We will bump the minimum python and numpy versions as we can every
 minor and major release, but never on a patch release.
 
 Python Dependencies
 ===================
 
-For python dependencies we should support at least
+For python dependencies we should support at least:
 
 with compiled extensions
-  minor versions released in the last 3 years
-  or the oldest that support our minimum python + numpy
+  minor versions initially released in the 36 months prior to our
+  planned release date or the oldest that support our minimum python +
+  numpy
 
 without complied extensions
-  minor versions released in the last 2 years or the oldest that
-  supports our minimum python.
+  minor versions initially released in the 24 months prior to our
+  planed release date or the oldest that supports our minimum python.
 
 We will only bump these dependencies as we need new features or the
 old versions no longer support our minimum numpy or python.
