diff --git a/pkgs/development/interpreters/python/default.nix b/pkgs/development/interpreters/python/default.nix
index e98cb89b77d..2f350738238 100644
--- a/pkgs/development/interpreters/python/default.nix
+++ b/pkgs/development/interpreters/python/default.nix
@@ -100,6 +100,8 @@ with pkgs;
         pythonAtLeast = lib.versionAtLeast pythonVersion;
         pythonOlder = lib.versionOlder pythonVersion;
         inherit hasDistutilsCxxPatch;
+        # TODO: rename to pythonOnBuild
+        # Not done immediately because its likely used outside Nixpkgs.
         pythonForBuild = pythonOnBuildForHost;
 
         tests = callPackage ./tests.nix {