diff --git a/pkgs/build-support/expand-response-params/default.nix b/pkgs/build-support/expand-response-params/default.nix
index 9371b7702362..7ce15e98c8d9 100644
--- a/pkgs/build-support/expand-response-params/default.nix
+++ b/pkgs/build-support/expand-response-params/default.nix
@@ -1,5 +1,12 @@
 { stdenv }:
 
+# A "response file" is a sequence of arguments that is passed via a
+# file, rather than via argv[].
+
+# For more information see:
+# https://gcc.gnu.org/wiki/Response_Files
+# https://www.intel.com/content/www/us/en/docs/dpcpp-cpp-compiler/developer-guide-reference/2023-0/use-response-files.html
+
 stdenv.mkDerivation {
   name = "expand-response-params";
   src = ./expand-response-params.c;