Mention PR# in the comment for future reference

src/_pytest/tmpdir.py

@@ -29,8 +29,8 @@ class TempPathFactory(object):
 
     _given_basetemp = attr.ib(
         # using os.path.abspath() to get absolute path instead of resolve() as it
-        # does not work the same in all platforms; there's Path.absolute(), but it is not
-        # public (see https://bugs.python.org/issue25012)
+        # does not work the same in all platforms (see #4427)
+        # Path.absolute() exists, but it is not public (see https://bugs.python.org/issue25012)
         convert=attr.converters.optional(
             lambda p: Path(os.path.abspath(six.text_type(p)))
         )