diff --git a/pkgs/development/interpreters/python/wrapper.nix b/pkgs/development/interpreters/python/wrapper.nix
index 727b9cbc676..fec07c0aff5 100644
--- a/pkgs/development/interpreters/python/wrapper.nix
+++ b/pkgs/development/interpreters/python/wrapper.nix
@@ -1,3 +1,6 @@
+# Create a python that knows about additional python packages via
+# PYTHONPATH
+
 {stdenv, python, makeWrapper, extraLibs ? []}:
 
 stdenv.mkDerivation {