diff --git a/src/rnote/app.rs b/src/rnote/app.rs
index 91cb3ce..fe40cdf 100644
--- a/src/rnote/app.rs
+++ b/src/rnote/app.rs
@@ -54,7 +54,11 @@ pub fn make_app() -> App<'static, 'static> {
                 .alias("l")
                 .alias("ls")
                 .about("List all notes or notes from a category.")
-                .arg(Arg::with_name("name").help("Name of the category."))
+                .arg(
+                    Arg::with_name("name")
+                        .help("Name of the category.")
+                        .requires("category"),
+                )
                 .arg(
                     Arg::with_name("category")
                         .help("List all notes from a category.")