diff --git a/migration-guides/0.15-Ecosystem-Update.md b/migration-guides/0.15-Ecosystem-Update.md
index ebd5899..1a95518 100644
--- a/migration-guides/0.15-Ecosystem-Update.md
+++ b/migration-guides/0.15-Ecosystem-Update.md
@@ -150,6 +150,7 @@ Breaking changes:
 Breaking changes:
 - Replaced polymorphic proxies with monomorphic `Proxy` ([#158](https://github.com/purescript/purescript-strings/pull/158) by @JordanMartinez)
 - In `slice`, drop bounds checking and `Maybe` return type ([#145](https://github.com/purescript/purescript-strings/pull/145) by Quelklef)
+- Make `RegexFlags` a `newtype` and a `Newtype` instance for it([#159](https://github.com/purescript/purescript-strings/pull/159) by @mhmdanas)
 
 Other improvements:
 - Surround code with backticks in documentation ([#148](https://github.com/purescript/purescript-strings/pull/148))
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