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.release-notes/4588.md

@@ -1,4 +1,4 @@
-## Fix soundness problem with matching iso variables
+## Fix soundness problem when matching `iso` variables
 
 We previously switched our underlying type system model. In the process, a
 soundness hole was introduced. The following code that should not compile was accepted by the compiler:
@@ -20,4 +20,4 @@ The code should not compile because `let s': String iso` is aliasing `_s` an iso
 
 The take-away is that "very bad things could happen" and the data race freedom guarantees of the Pony compiler were being violated.
 
-We've close the soundness hole. We recommend all Pony users update to the this release as soon as possible.
+We've closed the soundness hole. We recommend all Pony users update to the this release as soon as possible.