diff --git a/changelog.md b/changelog.md
index 6cf9e3a..009f2d8 100644
--- a/changelog.md
+++ b/changelog.md
@@ -9,6 +9,8 @@ A `### Breaking` section is used in addition to Keep a Changelog's standard sect
 
 ## [Unreleased]
 
+## [1.0.0] - 2026-03-20
+
 ### Added
 
 - Go CLI for changelog-driven release preparation and semantic version recommendation.
diff --git a/release-version b/release-version
new file mode 100644
index 0000000..3eefcb9
--- /dev/null
+++ b/release-version
@@ -0,0 +1 @@
+1.0.0