diff --git a/7. Case Studies/7. Case Studies.md b/7. Case Studies/7. Case Studies.md
index b7716d9..8bed557 100644
--- a/7. Case Studies/7. Case Studies.md	
+++ b/7. Case Studies/7. Case Studies.md	
@@ -1,16 +1,21 @@
 # Case Studies
 
-This chapter contains a variety of short case studies, based on real
+This chapter will contain a variety of short case studies, based on real
 experience, for a range of network types. It will never be complete, as
 every network is slightly different, and it will evolve as time goes on.
 
+A good set of existing case studies from ARIN members can be found in
+[the ARIN blog](https://www.arin.net/blog/ipv6/).
+
 This is an __open invitation__ to contribute a case study for this chapter.
 If you have deployed an IPv6 network, please write a short section
 with emphasis on what major choices you made, what worked well, and
 what problems you encountered. Even a summary in one paragraph would be helpful.
 Large and small enterprise networks, and large or small carrier networks,
-are all of interest. If you have already published such a description,
-just a pointer will be fine.
+are all of interest. It isn't necessary to identify the particular network,
+if you prefer to keep that private. 
+
+If you have already published such a description, just a pointer will be fine.
 
 [How to contribute](https://github.com/becarpenter/book6/blob/main/1.%20Introduction%20and%20Foreword/How%20to%20contribute.md#how-to-contribute)