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+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## 0.11.1 - TBD
 
+Features
+
+- Added support for immutable objects. Any quoted pairs, vectors, bytevectors, or strings will now be flagged as immutable, per R7RS.
+
 Bug Fixes
 
 - Fixed a bug where the compiler would not always validate the number of arguments passed to a locally-defined function.