diff --git a/notes.md b/notes.md
index ef29ef9..bdd6bd2 100644
--- a/notes.md
+++ b/notes.md
@@ -941,6 +941,10 @@ resolvable without more information.
 
 ### TODO:
 
+- Check for duplicate field labels. Particularly when using a base record.
+  It's easy to declare a field named 'midi' and then inherit a record with a field named 'midi' - this is a crash bug.
+  
+
 - DONE: Why doesn't the C7 on the downbeat of meas. 11 sound? (... it does but is quiet due to velocity table)
 - DONE: Allow setting the location of the score player.  This should also reset the sampler and voice control.
 - DONE: The voice ctl should respond to all-notes-off message and reset each sampler channel.
@@ -1415,6 +1419,11 @@ The new record effectively inherits the contents of the
 existing record by reference.  No data is copied.
 For an example of this see the `vel_table` implementation.
 
+Note that record field values may not be changed in place because
+this would change the value for all other processors that
+receive the record.  Incoming records must therefore be
+copied if they are changed.
+
 Variable Change Notification
 ----------------------------
 Processors are not directly notified when one of their connected variables changes.