diff --git a/pkgs/top-level/release-cross.nix b/pkgs/top-level/release-cross.nix
index ba4f998296e2..8e951611bbc0 100644
--- a/pkgs/top-level/release-cross.nix
+++ b/pkgs/top-level/release-cross.nix
@@ -1,4 +1,11 @@
 /* This file defines some basic smoke tests for cross compilation.
+   Individual jobs can be tested by running:
+
+   $ nix-build pkgs/top-level/release-cross.nix -A <jobname>.<package> --arg supportedSystems '[builtins.currentSystem]'
+
+   e.g.
+
+   $ nix-build pkgs/top-level/release-cross.nix -A crossMingw32.nixUnstable --arg supportedSystems '[builtins.currentSystem]'
 */
 
 { # The platforms *from* which we cross compile.