diff --git a/pep-0420.txt b/pep-0420.txt
index 2b3199145..53fd32e98 100644
--- a/pep-0420.txt
+++ b/pep-0420.txt
@@ -85,7 +85,7 @@ rejected, but the motivating use cases are still valid.
 Rationale
 =========
 
-The current imperative approach to namespace packages has lead to
+The current imperative approach to namespace packages has led to
 multiple slightly-incompatible mechanisms for providing namespace
 packages.  For example, pkgutil supports ``*.pkg`` files; setuptools
 doesn't.  Likewise, setuptools supports inspecting zip files, and
@@ -128,7 +128,9 @@ directory in the parent path:
    imported and returned.
 
  * If not, but ``<directory>/foo.{py,pyc,so,pyd}`` is found, a module
-   is imported and returned.
+   is imported and returned.  The exact list of extension varies by
+   platform and whether the -O flag is specified.  The list here is
+   representative.
 
  * If not, but ``<directory>/foo`` is found and is a directory, it is
    recorded and the scan continues with the next directory in the
@@ -314,7 +316,8 @@ They are:
   4. Implicit package directories will permanently entrench current
      newbie-hostile behavior in ``__main__``.
 
-Nick gave a detailed response [5]_, which is summarized here:
+Nick later gave a detailed response to his own objections[5]_, which
+is summarized here:
 
   1. The practicality of this PEP wins over other proposals and the
      status quo.