diff --git a/pkgs/development/libraries/libvorbis/default.nix b/pkgs/development/libraries/libvorbis/default.nix
index aa8763d6d67..42e7328a8ec 100644
--- a/pkgs/development/libraries/libvorbis/default.nix
+++ b/pkgs/development/libraries/libvorbis/default.nix
@@ -16,6 +16,8 @@ stdenv.mkDerivation rec {
 
   doCheck = true;
 
+  # strip -mno-ieee-fp flag from configure and configure.ac when using
+  # clang as the flag is not recognized by the compiler
   preConfigure = lib.optionalString (stdenv.cc.isClang or false) ''
     sed s/\-mno\-ieee\-fp// -i {configure,configure.ac}
   '';