diff --git a/src/bin/mdbook.rs b/src/bin/mdbook.rs
index 33b22913..a2e7bef3 100644
--- a/src/bin/mdbook.rs
+++ b/src/bin/mdbook.rs
@@ -58,20 +58,20 @@ fn main() {
                     .subcommand(SubCommand::with_name("init")
                         .about("Create boilerplate structure and files in the directory")
                         // the {n} denotes a newline which will properly aligned in all help messages
-                        .arg_from_usage("[dir] 'A directory for your book{n}(Defaults to Current Directory when ommitted)'")
+                        .arg_from_usage("[dir] 'A directory for your book{n}(Defaults to Current Directory when omitted)'")
                         .arg_from_usage("--theme 'Copies the default theme into your source folder'")
                         .arg_from_usage("--force 'skip confirmation prompts'"))
                     .subcommand(SubCommand::with_name("build")
                         .about("Build the book from the markdown files")
                         .arg_from_usage("-o, --open 'Open the compiled book in a web browser'")
-                        .arg_from_usage("[dir] 'A directory for your book{n}(Defaults to Current Directory when ommitted)'"))
+                        .arg_from_usage("[dir] 'A directory for your book{n}(Defaults to Current Directory when omitted)'"))
                     .subcommand(SubCommand::with_name("watch")
                         .about("Watch the files for changes")
                         .arg_from_usage("-o, --open 'Open the compiled book in a web browser'")
-                        .arg_from_usage("[dir] 'A directory for your book{n}(Defaults to Current Directory when ommitted)'"))
+                        .arg_from_usage("[dir] 'A directory for your book{n}(Defaults to Current Directory when omitted)'"))
                     .subcommand(SubCommand::with_name("serve")
                         .about("Serve the book at http://localhost:3000. Rebuild and reload on change.")
-                        .arg_from_usage("[dir] 'A directory for your book{n}(Defaults to Current Directory when ommitted)'")
+                        .arg_from_usage("[dir] 'A directory for your book{n}(Defaults to Current Directory when omitted)'")
                         .arg_from_usage("-p, --port=[port] 'Use another port{n}(Defaults to 3000)'")
                         .arg_from_usage("-w, --websocket-port=[ws-port] 'Use another port for the websocket connection (livereload){n}(Defaults to 3001)'")
                         .arg_from_usage("-i, --interface=[interface] 'Interface to listen on{n}(Defaults to localhost)'")