diff --git a/README.md b/README.md
index 5c7810e..708681f 100644
--- a/README.md
+++ b/README.md
@@ -4,8 +4,10 @@
 
 ## What?
 
-This thing was created from [Hello Rust Episode 10](https://hello-rust.show/10/).
-It's a link checker that treats Github links specially by using a `GITHUB_TOKEN` to avoid getting blocked by the bot protection.
+This thing was created from [Hello Rust Episode
+10](https://hello-rust.show/10/). It's a link checker that treats Github links
+specially by using a `GITHUB_TOKEN` to avoid getting blocked by the bot
+protection.
 
 ## How?
 
@@ -15,8 +17,14 @@ cargo install lychee
 
 Set an environment variable with your token like so `GITHUB_TOKEN=xxxx`.
 
-Run it inside a repository with a `README.md`.
+Run it inside a repository with a `README.md` or specify a different Markdown
+file with
+
+```
+lychee --input <yourfile.md>
+```
 
 ## Thanks
 
-...to my Github sponsors and Patreon sponsors for supporting these projects. If you want to help out as well, [go here](https://github.com/sponsors/mre/).
\ No newline at end of file
+...to my Github sponsors and Patreon sponsors for supporting these projects. If
+you want to help out as well, [go here](https://github.com/sponsors/mre/).
diff --git a/src/main.rs b/src/main.rs
index 1f0e720..c22bdfd 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -29,7 +29,7 @@ impl Checker {
         status == StatusCode::OK
     }
 
-    fn check_normal(&self, url: &String) -> bool {
+    fn check_normal(&self, url: &str) -> bool {
         let res = reqwest::blocking::get(url);
         if let Ok(res) = res {
             res.status().is_success()
@@ -38,19 +38,24 @@ impl Checker {
         }
     }
 
-    fn extract_github(&self, url: &String) -> Result<(String, String), Box<dyn Error>> {
-        let re = Regex::new(r"github\.com/(.*?)/(.*)/?")?;
+    fn extract_github(&self, url: &str) -> Result<(String, String), Box<dyn Error>> {
+        let re = Regex::new(r"github\.com/([^/]*)/([^/]*)")?;
         let caps = re.captures(&url).ok_or("Invalid capture")?;
         let owner = caps.get(1).ok_or("Cannot capture owner")?;
         let repo = caps.get(2).ok_or("Cannot capture repo")?;
         Ok((owner.as_str().into(), repo.as_str().into()))
     }
 
-    pub fn check(&self, url: &String) -> bool {
-        match self.extract_github(&url) {
-            Ok((owner, repo)) => self.check_github(owner, repo),
-            _ => self.check_normal(&url),
+    pub fn check(&self, url: &str) -> bool {
+        if self.check_normal(&url) {
+            return true;
         }
+        // Pull out the heavy weapons in case of a failed normal request.
+        // This could be a Github URL and we run into the rate limiter.
+        if let Ok((owner, repo)) = self.extract_github(&url) {
+            return self.check_github(owner, repo);
+        }
+        false
     }
 }
 
@@ -67,16 +72,18 @@ fn extract_links(md: &str) -> Vec<String> {
 
 struct Args {
     verbose: bool,
+    input: Option<String>,
 }
 
 fn main() -> Result<(), Box<dyn Error>> {
     let mut args = pico_args::Arguments::from_env();
     let args = Args {
         verbose: args.contains(["-v", "--verbose"]),
+        input: args.opt_value_from_str(["-i", "--input"])?,
     };
 
     let checker = Checker::new(env::var("GITHUB_TOKEN")?);
-    let md = fs::read_to_string("README.md")?;
+    let md = fs::read_to_string(args.input.unwrap_or("README.md".into()))?;
     let links: Vec<String> = extract_links(&md);
 
     let mut errorcode = 0;
@@ -106,7 +113,7 @@ mod test {
         let checker = Checker::new("foo".into());
         assert_eq!(
             checker
-                .extract_github(&"https://github.com/mre/idiomatic-rust".into())
+                .extract_github("https://github.com/mre/idiomatic-rust")
                 .unwrap(),
             ("mre".into(), "idiomatic-rust".into())
         );