diff --git a/src/interpret.h b/src/interpret.h
index 273984c8fd17eca045fb2481a53da86f5079798c..1e62f660316a72c558bc84ec585fc9b5fbe6864a 100644
--- a/src/interpret.h
+++ b/src/interpret.h
@@ -5,7 +5,7 @@
 \*/
 
 /*
- * $Id: interpret.h,v 1.49 2000/07/07 01:24:14 hubbe Exp $
+ * $Id: interpret.h,v 1.50 2000/07/07 03:01:24 hubbe Exp $
  */
 #ifndef INTERPRET_H
 #define INTERPRET_H
@@ -244,6 +244,17 @@ struct callback;
 extern struct callback_list evaluator_callbacks;
 extern void call_callback(struct callback_list *, void *);
 
+/* Things to try:
+ * we could reduce thread swapping to a pointer operation if
+ * we do something like:
+ *   #define Pike_interpreter (*Pike_interpreter_pointer)
+ *
+ * Since global variables are usually accessed through indirection
+ * anyways, it might not make any speed differance.
+ *
+ * The above define could also be used to facilitate dynamic loading
+ * on Win32..
+ */
 extern struct Pike_interpreter Pike_interpreter;
 
 #define Pike_sp Pike_interpreter.stack_pointer