diff --git a/docs/getting-started.md b/docs/getting-started.md
index cd43001..32565a9 100644
--- a/docs/getting-started.md
+++ b/docs/getting-started.md
@@ -80,7 +80,7 @@ repos:
 ```
 
 Run `pre-commit install` once in each clone. `--version=21` installs the newest 21.x wheel;
-clang-tidy wheels cover LLVM 13 to 22. The clang-tidy hook needs a `compile_commands.json`, which
+clang-tidy wheels cover LLVM 13 to 23. The clang-tidy hook needs a `compile_commands.json`, which
 it looks for in `build/` and a few other directories; leave it out if you only run clang-tidy in
 CI. [Set up a clang-format pre-commit hook](blog/posts/2026-09-20-clang-format-pre-commit-hook.md)
 walks through the whole setup.
@@ -97,9 +97,9 @@ cpp-linter --version=21 --style=file --tidy-checks=''
 - It does not install the clang tools. Install them first, for example with clang-tools below;
   without them, `--version=21` falls back to whatever `clang-format` is on your PATH.
 - It exits 0 even when checks fail, so it reports findings but does not fail a build.
-- Locally, `--files-changed-only` and `--lines-changed-only` read `git diff`. In other CI, check
-  the whole repository (the default): most CI systems set `CI=true`, and with it those options ask
-  the GitHub API for the changed files.
+- Locally and in other CI, `--files-changed-only` and `--lines-changed-only` read `git diff`;
+  `--diff-base` sets the commit to compare against. Only on GitHub Actions, which sets
+  `GITHUB_ACTIONS=true`, do they ask the GitHub API for the changed files.
 
 cpp-linter v2, a rewrite in Rust ([cpp-linter-rs](https://github.com/cpp-linter/cpp-linter-rs)),
 is in release candidates. Use the Python package until 2.0 is released.
@@ -124,5 +124,5 @@ llvm-symbolizer. The Docker images carry Ubuntu's clang-format and clang-tidy pa
 
 Single tools are also on PyPI as Python wheels: `clang-format` and `clang-tidy` (the wheels
 cpp-linter-hooks installs), [clang-apply-replacements](https://pypi.org/project/clang-apply-replacements/)
-(LLVM 16 and 17) and [clang-include-cleaner](https://pypi.org/project/clang-include-cleaner/)
+(LLVM 16 to 23) and [clang-include-cleaner](https://pypi.org/project/clang-include-cleaner/)
 (LLVM 22).
diff --git a/docs/overrides/home.html b/docs/overrides/home.html
index ed78e9c..a631817 100644
--- a/docs/overrides/home.html
+++ b/docs/overrides/home.html
@@ -153,7 +153,7 @@ <h1 class="cl-hero__title">
       },
       {
         "title": "Before every commit", "name": "cpp-linter-hooks", "icon": "octicons/git-commit-24",
-        "text": "pre-commit hooks that pip-install the clang-format and clang-tidy version you pin, on every developer's machine. clang-tidy wheels cover LLVM 13 to 22.",
+        "text": "pre-commit hooks that pip-install the clang-format and clang-tidy version you pin, on every developer's machine. clang-tidy wheels cover LLVM 13 to 23.",
         "code": "args: [--style=file, --version=21]",
         "href": "https://github.com/cpp-linter/cpp-linter-hooks", "cta": "View on GitHub",
       },
@@ -212,7 +212,7 @@ <h2 class="cl-h2">Pin the same LLVM version in each tool</h2>
             Different clang-format releases can format the same file
             differently. Set the same LLVM version in the action, the pre-commit
             hooks and on your machine, and every step runs the same major
-            release. The clang-tidy hook covers LLVM 13 to 22; the action and
+            release. The clang-tidy hook covers LLVM 13 to 23; the action and
             clang-tools cover 12 to 23.
           </p>
         </div>
diff --git a/docs/why-cpp-linter.md b/docs/why-cpp-linter.md
index 2d7bd8d..91ca152 100644
--- a/docs/why-cpp-linter.md
+++ b/docs/why-cpp-linter.md
@@ -38,7 +38,7 @@ is no Docker image to build before the first result.
 
 The same tools run outside the action too. The pre-commit hooks in
 [cpp-linter-hooks](https://github.com/cpp-linter/cpp-linter-hooks) take the same version number
-(the clang-tidy hook covers LLVM 13 to 22). The [cpp-linter](https://pypi.org/project/cpp-linter/)
+(the clang-tidy hook covers LLVM 13 to 23). The [cpp-linter](https://pypi.org/project/cpp-linter/)
 CLI runs from a script or another CI system; it expects the clang tools to be installed already
 and exits 0 even when checks fail. On a laptop, `clang-tools` installs the binaries.