diff --git a/nixpkgs_review/cli/__init__.py b/nixpkgs_review/cli/__init__.py
index 3cc92d3c..a3e9e3e5 100644
--- a/nixpkgs_review/cli/__init__.py
+++ b/nixpkgs_review/cli/__init__.py
@@ -219,7 +219,7 @@ def common_flags() -> list[CommonFlag]:
             "--systems",
             type=str,
             default="current",
-            help="Nix 'systems' to evaluate and build packages for",
+            help="Nix 'systems' to evaluate and build packages for (e.g. 'all' or 'x86_64-linux aarch64-darwin')",
         ),
         CommonFlag(
             "--system",