diff --git a/README.md b/README.md
index ce7e3a7..5c0eb5d 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,7 @@ Available as a command-line utility, a library and a [GitHub Action](https://git
 
 <!-- START doctoc generated TOC please keep comment here to allow auto update -->
 <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
+
 ## Table of Contents
 
 - [Installation](#installation)
@@ -120,7 +121,7 @@ This comparison is made on a best-effort basis. Please create a PR to fix
 outdated information.
 
 |                      | lychee  | [awesome_bot] | [muffet] | [broken-link-checker] | [linkinator] | [linkchecker]        | [markdown-link-check] | [fink] |
-|----------------------|---------|---------------|----------|-----------------------|--------------|----------------------|-----------------------|--------|
+| -------------------- | ------- | ------------- | -------- | --------------------- | ------------ | -------------------- | --------------------- | ------ |
 | Language             | Rust    | Ruby          | Go       | JS                    | TypeScript   | Python               | JS                    | PHP    |
 | Async/Parallel       | ![yes]  | ![yes]        | ![yes]   | ![yes]                | ![yes]       | ![yes]               | ![yes]                | ![yes] |
 | JSON output          | ![yes]  | ![no]         | ![yes]   | ![yes]                | ![yes]       | ![maybe]<sup>1</sup> | ![yes]                | ![yes] |
@@ -341,7 +342,7 @@ Options:
           Proceed for server connections considered insecure (invalid TLS)
 
   -s, --scheme <SCHEME>
-          Only test links with the given schemes (e.g. http and https)
+          Only test links with the given schemes (e.g. https). Omit to check links with any other scheme. At the moment, we support http, https, file, and mailto
 
       --offline
           Only check local files and block network requests
@@ -575,6 +576,7 @@ If you find a way to make lychee faster, please do reach out.
 We collect a list of common workarounds for various websites in our [troubleshooting guide](./docs/TROUBLESHOOTING.md).
 
 ## Users
+
 - https://github.com/InnerSourceCommons/InnerSourcePatterns
 - https://github.com/opensearch-project/OpenSearch
 - https://github.com/ramitsurana/awesome-kubernetes
@@ -610,6 +612,5 @@ lychee is licensed under either of
 
 at your option.
 
-
 <br><hr>
 [🔼 Back to top](#back-to-top)
diff --git a/fixtures/configs/smoketest.toml b/fixtures/configs/smoketest.toml
index fa91e9a..afa526b 100644
--- a/fixtures/configs/smoketest.toml
+++ b/fixtures/configs/smoketest.toml
@@ -52,8 +52,9 @@ accept = [200, 429]
 insecure = false
 
 # Only test links with the given schemes (e.g. https).
-# Omit to check links with any scheme.
-scheme = [ "https" ]
+# Omit to check links with any other scheme.
+# At the moment, we support http, https, file, and mailto.
+scheme = ["https"]
 
 # When links are available using HTTPS, treat HTTP links as errors.
 require_https = false
@@ -66,7 +67,7 @@ headers = []
 
 # Remap URI matching pattern to different URI.
 # This also supports (named) capturing groups.
-remap = [ 
+remap = [
     "https://example.com http://example.invalid",
     "https://example.com/(.*) http://example.org/$1",
     "https://github.com/(?P<org>.*)/(?P<repo>.*) https://gitlab.com/$org/$repo",
@@ -93,13 +94,13 @@ include_verbatim = false
 glob_ignore_case = false
 
 # Exclude URLs and mail addresses from checking (supports regex).
-exclude = [ '.*\.github.com\.*' ]
+exclude = ['.*\.github.com\.*']
 
 # Exclude these filesystem paths from getting checked.
 exclude_path = ["file/path/to/Ignore", "./other/file/path/to/Ignore"]
 
 # URLs to check (supports regex). Has preference over all excludes.
-include = [ 'gist\.github\.com.*' ]
+include = ['gist\.github\.com.*']
 
 # Exclude all private IPs from checking.
 # Equivalent to setting `exclude_private`, `exclude_link_local`, and
diff --git a/lychee-bin/src/options.rs b/lychee-bin/src/options.rs
index 52c2b2e..2e40f37 100644
--- a/lychee-bin/src/options.rs
+++ b/lychee-bin/src/options.rs
@@ -230,7 +230,9 @@ pub(crate) struct Config {
     #[serde(default)]
     pub(crate) insecure: bool,
 
-    /// Only test links with the given schemes (e.g. http and https)
+    /// Only test links with the given schemes (e.g. https).
+    /// Omit to check links with any other scheme.
+    /// At the moment, we support http, https, file, and mailto.
     #[arg(short, long)]
     #[serde(default)]
     pub(crate) scheme: Vec<String>,
diff --git a/lychee.example.toml b/lychee.example.toml
index 9c23c8a..fab29ac 100644
--- a/lychee.example.toml
+++ b/lychee.example.toml
@@ -52,8 +52,9 @@ accept = [200, 429]
 insecure = false
 
 # Only test links with the given schemes (e.g. https).
-# Omit to check links with any scheme.
-scheme = [ "https" ]
+# Omit to check links with any other scheme.
+# At the moment, we support http, https, file, and mailto.
+scheme = ["https"]
 
 # When links are available using HTTPS, treat HTTP links as errors.
 require_https = false
@@ -65,7 +66,7 @@ method = "get"
 headers = []
 
 # Remap URI matching pattern to different URI.
-remap = [ "https://example.com http://example.invalid" ]
+remap = ["https://example.com http://example.invalid"]
 
 # Base URL or website root directory to check relative URLs.
 base = "https://example.com"
@@ -88,16 +89,13 @@ include_verbatim = false
 glob_ignore_case = false
 
 # Exclude URLs and mail addresses from checking (supports regex).
-exclude = [
-    '^https://www\.linkedin\.com',
-    '^https://web\.archive\.org/web/',
-]
+exclude = ['^https://www\.linkedin\.com', '^https://web\.archive\.org/web/']
 
 # Exclude these filesystem paths from getting checked.
 exclude_path = ["file/path/to/Ignore", "./other/file/path/to/Ignore"]
 
 # URLs to check (supports regex). Has preference over all excludes.
-include = [ 'gist\.github\.com.*' ]
+include = ['gist\.github\.com.*']
 
 # Exclude all private IPs from checking.
 # Equivalent to setting `exclude_private`, `exclude_link_local`, and