diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6793766..a4c0e2c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ This project has a published GitHub Release line, but no stable support or API g
 
 ### Changed
 
+- Added Ruff linting to local checks and CI by installing project development dependencies before running `./scripts/check.sh`.
 - Synced support, security, README, and release-truth documentation after the published `v0.2.0` GitHub Release.
 - Added CLI output examples and governance rules reference documentation after the `v0.2.0` tag.
 
diff --git a/README.md b/README.md
index a370049..d41598b 100644
--- a/README.md
+++ b/README.md
@@ -342,6 +342,7 @@ The local check suite verifies:
 
 - Python syntax;
 - unit tests;
+- Ruff lint checks;
 - UTF-8 text files;
 - LF line endings;
 - final newline;
@@ -354,7 +355,7 @@ Current verified local result on `main`:
 
 The exact unit test count may change as coverage evolves. The source of truth is the current `./scripts/check.sh` output and the matching GitHub Actions run for `main`.
 
-CI runs the same local check script through GitHub Actions.
+CI installs project development dependencies and then runs the same local check script through GitHub Actions.
 
 The required status check for `main` is: