diff --git a/README b/README
index a065f2c..097a8ae 100644
--- a/README
+++ b/README
@@ -6,4 +6,11 @@ various versions in svn, so that changes will be trackable thataway.
 The version as of this moment in svn is 6.3
 
 (I didn't add this file in PQ 6.0, but after that you can use this README
-to trace the checkin history using svn.)
\ No newline at end of file
+to trace the checkin history using svn.)
+
+Revsion numbers vs. versions:
+r321 v6.3 as I found it after a couple years of inactivity
+r320 v6.2 probably as released, though I'm not totally sure
+r318 v6.2 but probably a slightly older version
+r317 v6.1
+r313 v6.0