diff --git a/docs/development.md b/docs/development.md
index 62e557de..4d0712aa 100644
--- a/docs/development.md
+++ b/docs/development.md
@@ -11,7 +11,7 @@
 
 This project more or less follows [Semantic Versioning](https://semver.org/).
 
-Which boils down to the following rules of thumb regarding stability:
+Which boils down to the following these rules of thumb regarding stability:
 
 - **Patch releases**: `0.x.n` → `0.x.(n+1)` upgrades
 
@@ -56,7 +56,7 @@ $ source .venv/bin/activate
 $ uv pip install --all-extras .
 ```
 
-Now you’re ready to hack and abuse git!
+Now you’re ready to hack and abuse `git`.
 
 ## Test `mdedup` development version
 
@@ -73,6 +73,7 @@ mdedup, version 7.3.1
 Run unit-tests with:
 
 ```shell-session
+$ uv install ".[test]"
 $ uv run pytest
 ```
 
@@ -102,6 +103,7 @@ To produce clean and fancy terminals screenshots, use either:
 - [Graphite Shot](https://graphite-shot.now.sh)
 - [Carbon](https://github.com/carbon-app/carbon)
 - [CodeKeep](https://codekeep.io/screenshot)
+- [chalk.ist](https://chalk.ist)
 
 ## Changelog
 
diff --git a/docs/install.md b/docs/install.md
index 850e89fd..51daaf3a 100644
--- a/docs/install.md
+++ b/docs/install.md
@@ -11,7 +11,9 @@ Easiest way is to [install `pipx`](https://pipx.pypa.io/stable/installation/), t
 $ pipx install mail-deduplicate
 ```
 
+```{note}
 `pipx` is to `pip` what `npx` is to `npm`: a clean way to install and run Python applications in isolated environments.
+```
 ````
 
 ````{tab-item} pip
diff --git a/pyproject.toml b/pyproject.toml
index 6667324b..d60666f0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -155,3 +155,20 @@ filename = "./citation.cff"
 regex = true
 search = "date-released: \\d{{4}}-\\d{{2}}-\\d{{2}}"
 replace = "date-released: {utcnow:%Y-%m-%d}"
+
+[tool.typos]
+default.extend-ignore-identifiers-re = [
+    # error: `ist` should be `is`, `it`, `its`, `sit`, `list`
+    #   --> ./docs/development.md:121:10
+    #     |
+    # 121 | - [chalk.ist](https://chalk.ist)
+    #     |          ^^^
+    #     |
+    # error: `ist` should be `is`, `it`, `its`, `sit`, `list`
+    #   --> ./docs/development.md:121:29
+    #     |
+    # 121 | - [chalk.ist](https://chalk.ist)
+    #     |                             ^^^
+    #     |
+    "ist",
+]