diff --git a/src/content/docs/changelog/index.mdx b/src/content/docs/changelog/index.mdx
index 180d8b52..9582372b 100644
--- a/src/content/docs/changelog/index.mdx
+++ b/src/content/docs/changelog/index.mdx
@@ -1,6 +1,6 @@
 ---
 title: Overview
-lastUpdated: 2026-06-20
+lastUpdated: 2026-06-24
 description: Release notes and version history for fullstackhero.
 sidebar:
   order: 1
@@ -11,6 +11,10 @@ seo:
 
 Notable changes to the kit, newest first.
 
+## 2026-06-24
+
+- **Config: the tenant billing grace-period setting was renamed `Billing:GraceWindowDays` → `Billing:GracePeriodDays` (breaking).** The option (bound in both `TenantBillingOptions` and Identity's `TenantGraceOptions`) is now named consistently with the "grace period" term used everywhere else in the kit; the default of 7 days is unchanged. Deployments that set `Billing:GraceWindowDays` (env `Billing__GraceWindowDays`) must rename the key to `Billing:GracePeriodDays`, otherwise the override is silently ignored and the default applies. No public contract change — the `GraceEndsUtc` tenant-status and integration-event fields are untouched. See PR [#1313](https://github.com/fullstackhero/dotnet-starter-kit/pull/1313).
+
 ## 2026-06-20
 
 - **The `fsh` CLI and `dotnet new` template are now on NuGet as stable `10.0.0`.** The two distribution packages that 10.0.0 had been waiting on have shipped: `FullStackHero.CLI` (install with `dotnet tool install -g FullStackHero.CLI` — no more `--prerelease`) and `FullStackHero.NET.StarterKit` (`dotnet new install FullStackHero.NET.StarterKit`). Because `fsh new` scaffolds *from* that template, the one-command flow is now end-to-end: `dotnet tool install -g FullStackHero.CLI && fsh new MyApp` produces a fully renamed project — unique JWT signing key, generated Docker secrets, `npm install` run, initial commit on `main`. The [Install](/docs/getting-started/install/) and [CLI](/docs/cli/) pages now lead with the CLI as the recommended path; `git clone` and the GitHub template remain available for reading the source or zero-install runs. See the [10.0.0 release](https://github.com/fullstackhero/dotnet-starter-kit/releases/tag/10.0.0).