diff --git a/src/cli.rs b/src/cli.rs
index c438f14..0f69a8c 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -1,11 +1,12 @@
 extern crate clap;
-use clap::{App, Arg};
+use clap::{App, AppSettings, Arg};
 
 pub fn get_args() -> clap::ArgMatches<'static> {
     App::new("LiQuid Screen Dim")
         .version(env!("CARGO_PKG_VERSION"))
         .author(env!("CARGO_PKG_AUTHORS"))
         .about(env!("CARGO_PKG_DESCRIPTION"))
+        .setting(AppSettings::ArgRequiredElseHelp)
         .arg(
             Arg::with_name("dim")
                 .long("dim")