docs(CHANGES,MIGRATION): Note the latest

tony · tony · commit 780cf52df29f · 2022-10-09T23:50:40.000-05:00
diff --git a/CHANGES b/CHANGES
@@ -10,7 +10,9 @@ $ pip install --user --upgrade --pre libtmux
 
 ## libtmux 0.16.x (unreleased)
 
-- _Insert changes/features/fixes for next release here_
+- _Notes on upcoming releases will be added here_
+
+<!-- Maintainers and contributors: Insert change notes for the next release above -->
 
 ## libtmux 0.15.8 (2022-10-02)
 
diff --git a/MIGRATION b/MIGRATION
@@ -21,7 +21,9 @@ well.
 
 ## Next release
 
-_Add migration notes here_
+_Migration instructions for the upcoming release will be added here_
+
+<!-- Maintainers and contributors: insert migration notes for the next release here -->
 
 <!---
 # vim: set filetype=markdown:
