diff --git a/pep-0009.txt b/pep-0009.txt
index 3686cbcad..35e54639a 100644
--- a/pep-0009.txt
+++ b/pep-0009.txt
@@ -57,7 +57,11 @@ How to Use This Template
     - Change the Title header to the title of your PEP.
 
     - Leave the Version and Last-Modified headers alone; we'll take
-      care of those when we check your PEP into CVS.
+      care of those when we check your PEP into Python's Subversion
+      repository.  These headers consist of keywords ("Revision" and
+      "Date" enclosed in "$"-signs) which are automatically expanded
+      by the repository.  Please do not edit the expanded date or
+      revision text.
 
     - Change the Author header to include your name, and optionally
       your email address.  Be sure to follow the format carefully:
diff --git a/pep-0012.txt b/pep-0012.txt
index a9171cac8..628ca9681 100644
--- a/pep-0012.txt
+++ b/pep-0012.txt
@@ -68,7 +68,10 @@ directions below.
 - Change the Title header to the title of your PEP.
 
 - Leave the Version and Last-Modified headers alone; we'll take care
-  of those when we check your PEP into CVS.
+  of those when we check your PEP into Python's Subversion repository.
+  These headers consist of keywords ("Revision" and "Date" enclosed in
+  "$"-signs) which are automatically expanded by the repository.
+  Please do not edit the expanded date or revision text.
 
 - Change the Author header to include your name, and optionally your
   email address.  Be sure to follow the format carefully: your name