Updates release notes for PR #4283

ponylang · Dec 29, 2022 · 235d459 · 235d459
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diff --git a/.release-notes/4283.md b/.release-notes/4283.md
diff --git a/.release-notes/next-release.md b/.release-notes/next-release.md
@@ -24,3 +24,9 @@ actor Main
 The use of T: UnsignedInteger[T] is valid and expected, but wasn't
 being handled correctly in this situation by the typechecker in this context.
 
+# Fix a major bug which allowed mutating fields of a val object
+
+A bug was introduced in 0.51.2 which caused some checks to allow mutating fields of a val object due to changes to some operations on capabilities. This bug is fixed: immutability is now checked separately from other properties.
+
+If you are using Pony 0.51.2 to 0.52.3, you should upgrade to the 0.52.4 release that contains this fix as soon as possible.
+