diff --git a/CHANGES.rst b/CHANGES.rst
index bb38a4061..4d2af1432 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -5,6 +5,9 @@ These features will be included in the next release:
 
 Added
 -----
+- New exit codes 2 for file not found, 3 for invalid command line arguments, 4 for
+  missing dependencies and 123 for unknown failures.
+- Display exit code in parentheses after error message.
 
 Fixed
 -----