diff --git a/Running-a-public-or-community-server.md b/Running-a-public-or-community-server.md
index 1e57c98..d9e199b 100644
--- a/Running-a-public-or-community-server.md
+++ b/Running-a-public-or-community-server.md
@@ -483,7 +483,11 @@ This plugin is currently unstable at the moment, so don't allow it.
 
 *Privacy image cache*
 
-Version 0.1 is buggy and should probably not be used on a public/community until it is repaired.
+When enabled, all external images will be cached on, and served from your own server. This acts as a barrier between your users and unethical networks like Facebook, which include tracking code in their images.  Facebook will be able to see your server, but they won't be able to see any of your individual members.
+
+Server Impact - there is a noticeable performance hit the first time you activate this as cache for old, but still viewable images is generated in one go.  This only happens once, and lasts around an hour.  From then on, new images are added "on the fly" rather than lots in one go, and the impact is negligible from this point on.
+
+Impact to support requests - beneficial.  Nobody asks why Facebook social graph appears in their stream anymore.
 
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