diff --git a/README.md b/README.md
index 48f0e73..eaacd0a 100644
--- a/README.md
+++ b/README.md
@@ -202,6 +202,16 @@ This will ensure that your application stays up to date with any schema changes.
 * You must have already run migrations at least up to v0.3.0. Check to
   make sure you're schema version is at least 20131011155638 by running rake
   db:version before you upgrade beyond v0.4.0
+* Notice fingerprinting has changed and is now easy to configure. But this
+  means you'll have to regenerate fingerprints on old notices in order to for
+  them to be properly grouped with new notices. To do this run: `rake
+  errbit:notice_refingerprint`. If you were using a custom fingerprinter class
+  in a previous version, be aware that it will no longer have any effect.
+  Fingerprinting is now configurable within the Errbit UI.
+* Prior to v0.4.0, users were only able to see apps they were watching.  All
+  users can now see all apps and they can watch or unwatch any app. If you were
+  using the watch feature to hide secret apps, you should not upgrade beyond
+  v0.4.0.
 
 ### Upgrading errbit from v0.3.0 to v0.4.0
 
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libgit2 0.21.2