diff --git a/pkgs/os-specific/linux/rewritefs/default.nix b/pkgs/os-specific/linux/rewritefs/default.nix
index ac796c1fe589..8ec46d64600a 100644
--- a/pkgs/os-specific/linux/rewritefs/default.nix
+++ b/pkgs/os-specific/linux/rewritefs/default.nix
@@ -14,6 +14,7 @@ stdenv.mkDerivation rec {
   buildInputs = [ pkgconfig fuse pcre ];
 
   prePatch = ''
+    # do not set sticky bit in nix store
     substituteInPlace Makefile --replace 6755 0755
   '';