diff --git a/shell.nix b/shell.nix
index a98e1d32d..dd5093117 100644
--- a/shell.nix
+++ b/shell.nix
@@ -2,6 +2,7 @@ with import <nixpkgs> {};
 stdenv.mkDerivation {
   name = "blankart-env";
   buildInputs = [ cmake gcc ninja sdl3 zlib libpng openal libsndfile miniupnpc curl libopenmpt game-music-emu ];
-  # cmake flags, add -DSRB2_CONFIG_NOVERIFYIWADS=ON to build without IWAD verification
+  # cmake flags, add -DSRB2_CONFIG_NOVERIFYIWADS=ON to the below command to build without IWAD verification
+  # Usage from build/: cmake .. $cmakeFlags
   cmakeFlags = ["-DSDL3_INCLUDE_DIR=${lib.getDev sdl3}/include -DOPENMPT_INCLUDE_DIR=${lib.getDev libopenmpt}/include"];
 }